I recently added a project regarding this question.
Basically sex is these days mostly not related to reproduction. Instead it fulfills other function. People have sex for enjoyment, out of love, in order to relax or to have certain experiences involving satisfaction or even something spiritual.
In that regard an orgasm, which may be a peak orgasm (following the stages publishes by Masters and Johnson), is possibly the goal but not the only reason such an experience is wanted and looked for. People may want sex for many other aspects of a sexual experience.
Whereas males may be less interested in a broader experience than females and females even need that part of sexuality to reach a peak orgasm, females may also have a greater variety in term of both what contributes to excitement and what is experienced as orgiastic, fulfilling etc.
Sexual behaviour is arguably more related to consciousness than to mere physiology. People make conscious choices to have sex, use contraceptives and engage in different forms of sexual activities and experiences. There may be a lot of unconsciousness involved as well. People may be driven to have a lot of sex, because they are addicted or need it for relaxation, to be able to sleep etc. They may want it to fulfill psychological needs that they are not (fully) aware of.
If you are interested in these questions, please check out this project: https://www.researchgate.net/project/Consciousness-and-female-orgasms
We are still looking for collabators.
Cheers
Hans Ricke
https://www.researchgate.net/project/Consciousness-and-female-orgasms