To avoid her becoming bored. Kiss Her Right There, Like That...

News flash: The passion will fade with time—no matter how eagerly she jumped in the sack when you first started dating.
But less urgency doesn't have to translate to all-out boredom in the bedroom. After you've been together for a while, you don’t feel I-want-to-rip-your-clothes-off lust as often , but you still want the person. Boredom is more of an aversive state—like, "I'm not really feeling this at all" As a man I have heard this once or twice before... there  I start become more creating in my approaches.
So how can you tell when your girlfriend or wife  has drifted into “I could care less about sex” territory? Watch for these five signs—some subtle, others glaring—that she’s checked out in the sack, and learn how to re-engage her before your sexual deficit carries over to the snooze state for the rest of your relationship.

1.  She regularly goes to bed at a different time than you.

Maybe she really doesn't want to watch  the 11pm news on your home town TV channel  with you.
There's a more likely reason for her early bedtime: she’s aiming to avoid intimacy with you.  REALLY?  We men are usually the ones avoiding the "Intimacy" sessions. So if she is trying not to be in bed at the same time [as you], you need to fix it asap. Women don't talk about doing this on purpose, but they do it on purpose. (Conversely, some women may linger in the living room until you've dozed off, with a similar goal of deflecting your come-ons.)  if you are smart, You might set your phone to alarm about 12 pm, with the  same ringtone as your get out of jail buddy calling you , who she  may think has a double date setup for you. chances are she will fall for the fake call , and start thinking , she might wonder: 'who the hell is calling in him at this time of night and  where the hell does he think he is  going, with out me?' 

Get  her interested: You could try initiating sex earlier, since she may just be frustrated with your late-night attempts of  moves on her.  And that doesn't just mean executing your normal moves at 6 p.m. instead of midnight: When women are losing interest, men really need to have good seduction skills to lure them back  in.  don't use Blunt  questions like, “Wanna have sex?” this isn't an acceptable entree to intimacy. So talk to your love  partner about what sparks her libido—and let her know it’s okay if she currently has little motivation to make love. That way, she knows you don’t expect her to be hot and horny instantly—and that you’re willing to work toward revving up her desire together. 

2. She wants to stick with one position during sex.

this is An especially BAD sign: She favors the move that she knows gets you off fastest. She wants it to be over and done with,  ASAP. If she’s like, ‘Let’s not switch things up—let’s just do this and be done,’ she’s not interested in feeling more pleasure. It’s totally obligatory, going through the motions.

Get  her interested: If you’re running a one-position show, try adding an extra element of pleasure for her: Break out the vibrator, and stimulate her hot spots while before and while you're thrusting,  while you have her engaged. Hopefully, once she’s reminded how awesome her Oooh, Aaaaah feels—and even the pleasure leading up to it—she’ll re-engage in the experience. Or even better, guide her into a new position entirely—ideally, one that requires standing or bending. She might love it in a dark closet—there was something illicit about being in a dark closet. <smirking> Standing sex forces your nervous system to work a little bit harder—and that means she can’t drift off into that detached, halfway asleep state during sex. tricks learned after 25 years of  marriage. <smiling> 

3. When you offer to get her off, she declines.

It’s one thing to decline giving you a B.J., since that can be a lot of work, in her mind. But to refuse her own pleasures? Oooh boy... now you have work to do. That’s a double BAD sign, my friends. Having an orgasm—and the process it takes to get there—can be very sensual, relaxing, and connecting. If she doesn't value those things—and would rather just sleep—your connection may no longer be strong enough to entice her into bed. This level of apathy may indicate a deeper issue. Sometimes, there are other emotions loaded into boredom, like irritation, anger, and disappointment.

Get her interested: She may sense that you’re offering an orgasm for your own personal ego boost—not because you really want to give her pleasure. So before giving up, let her know you’re all about her. a simple statement like: "You don’t want me to make you feel good? Tell me more—I want to do this for you.” See if you can playfully engage her. This brings her into the moment—sort of like going from the ‘no’ to the ‘maybe’ to the ‘yes.’ remember your teenage years. 

If she’s still not interested, bring it up outside the bedroom in the morning. Demonstrate curiosity about her experience of your sex life—something we  men don’t do, because we mostly don't care. It’s an opportunity to see what’s going on in the relationship that might make her not want to connect. you want to fix it unless you really don't care.

4. She asks, “Did you finish?” before you actually did.

Translation: “You’re lasting too long—let’s wrap this things up!” A lot of us guys think women want sex to last a long time—like 30 minutes or more. But, the truth is, most women are totally cool with a 10-minute session; any longer, and they may start to lose their lubrication, which is just uncomfortable. Half an hour may seem especially long to a woman who can’t climax during intercourse.  so beating a dead horse, is just that, you will not awaken that feeling in her. she will fake an orgasm just to make you feel like you have done something.

Get her interested: The BAD news is: These three little words can put immense performance pressure on you, making it even harder to climax on demand. If you’re nowhere close to finishing, work on drawing her attention. Caress her face, and make intimate eye contact with her. Connection is a huge turn-on for women. Another libido booster: sensing that your desire is specifically directed toward her. Gazing into her eyes is a surefire signal that your arousal is aimed entirely her way. Another tricks learned after 25 years of  marriage. <smirking> 

5. She doesn't want to strip down completely during sex.

Sometimes, it’s erotic to keep an article of clothing on—but apart from a rushed-and-raunchy quickie, a refusal to get totally nude can be a sign she’s not really interested in connecting with you. (One caveat: If this is a consistent issue, she may just be body-conscious. It’s when she suddenly starts keeping her top on that you have to worry about boredom.) It’s a bit lazy. And it can even be a bit hostile, like, ‘You just want to f*ck me, I’m not going to take everything off, here you go. this all you get A$$hole!'

Get her interested: Guide her through a sexy striptease: Tell her to slowly take off her blouse—or just seductively ask her to show you her belly button—then tell her how much you love seeing her breasts. Use your words to be sort of commanding, but also pleasing—like Do this, oh that’s nice, now do this,” . When women feel desired, it incites their desire a little bit more, when you narrate the action .

disclaimer: Even-though I've  learned  a few tricks during  my 25 years of  marriage.  she still divorced and dumped me <smirking> so you may try my stuff but don't blame me if they don't work!

Maybe a little Keith Sweat might work better!