I'll just tell u some things about women that might explain these why shyt like this happens.
1.) Birth Control-I HATE BC. It fukks up female sex drive, can dry you out, make u gain weight, and fukks with ur hormones. I got on BC once and became SUPER depressed and didn't want to even contemplate ANYTHING sexual, which is ironic b/c u get on BC so u can have sex w/o worrying about pregnancies. So if u have a wife or a woman on BC and u notice she's fukking bonkers, get her off. Shallowing a bunch of artificial hormones just doesn't bode well for our mental health. A month later off BC...let's just say we were going thru boxes of condoms on the weekends.
2.) Sex doesn't start in the bedroom. As women we don't turn it on and off like men do. A woman's desire to have sex isn't simply about the act. We're just not wired that way. But women are socialized to be sexual in the way men are sexual these days and men thus relate to women sexually the way they understand their own sexuality. Both parties are missing the mark. There's a reason why romance novels and fantasy can have a chick getting creamy from masturbation alone, while she cringes at u touching her. It's not that there is anything wrong with you. In fact she could even be fantasizing ABOUT u. But she has crafted a perfect, complex, contextual romantic fantasy version of you coupled with direct clitoris stimulation. OF COURSE she prefers that. So I would advise women to communicate with men more about this b/c a sexless relationship is not okay. AT ALL. And I advise men to realize that romance is as strong a need for women as sex is for men.
3.) Emotionally ya'll fukked up. Men can fukk women they literally can't stand as long as they turn u on. Ya'll can hate fukk chicks.
For women, that just doesn't work for us. Our minds and hearts are tied to our p*ssy. If you have irritated, disrespected, neglected or ignored our emotional needs, the LAST thing she wants is to see u huffing and puffin on top of her. If she stressed, sex isn't a priority. Strengthen the emotional bond between u and you'll have to beat her off with a stick.
4.) She doesn't like herself. Women are always self-conscious about our bodies. Your approval helps but can only supplement but not supplant a woman's view of herself. If she doesn't like the way she looks, she's not going to feel comfortable with u and none of this is ur fault as a man. Talk to her about it and u may have to dip if it doesn't get better b/c ultimately, even when u love somebody, ur not responsible for their view of themselves.
5.) You not as good at sex as you think- Women fake and this leads to a lot of dudes inflating their own skill level. And porn can't teach u much either. Experience and willingness to listen and try different things, as well as being sensual, and passionate makes for a good lover.
If ur the guy that kisses her for a couple of seconds, expects her to give a lil head, rubs her clit for a lil bit, then humps her, that might not be enough. Take ur time, don't ignore her clit, build intensity through eye contact, dirty talk and praise, alternating speed and intensity of strokes, not being afraid of bodily fluids, caresses before and after sex.
All of that will make her want more. And in some cases...
6.) SHE sucks at sex, which isn't necessarily bad unless u either don't want to teach her OR she too stupid or stubborn to learn. Awkward rhythm, excessive shyness, overthinks too much, not in touch with her femininity, just wants to rush and get it over, never gets wet, prudish.
Communicate but if it doesn't change, she gotta go.
7.) Lastly b/c we tend to want to have sex with men we are emotionally attached to, there is a good chance she not feeling you or is unattracted to you. The p*ssy is one of the most honest parts of a chick outside of confounding biological variables like BC fukking up ur hormones.
If there isn't anything like that going on, she just doesn't want you. PLENTY of women stay in relationships and have sex with dudes just for a certain lifestyle or just to say they got somebody but they don't love em. Pls don't waste ur youth on some chick trying to use u.
Sex isn't the most important part of a relationship, but I consider it to be the pulse. It tells you about the quality of the relationship. If both aren't having a fulfilling sex life, IMO, that foreshadows major issues in the relationship.
Just my two cents.