[Tab has been here before, but here I go, also.] 
Sex & Philosophy.
I will now go through a raw and amoral thesis about the mechanics of human sexuality.
1
Awareness: Someone or something acts sexual, and it is witnessed by the mind.
2
Curiosity: That was new. When a question is answered in a satisfactory way, the nucleus accumbens tend to feel a bit stimulated, and learning something new causes a slight “high”. In some ways similar to the orgasm, there must first be a sort of inner calling for action, a desire, a Will, and then once the call as been answered, the pressure is released along with some sort of pleasure. The systemic factors of curiosity combine with the systemic factors of sexual attraction and egoist-internal-reactions, manifesting as a composite sensation known as “sexuality”. Inborn instincts, constructed preferences and mobilizations all form the sexual Will.
3
Actuation: Most likely in a fantasy, the sexual Will is given form, eventually actuated.
Complex factors:
Self-image is a big factor. It is wholly what a man or women thinks that they are, thinks what they should be, and thinks what they should not be, and this is judged by that persons actions. But, actions [in and of thyself] have no meaning at all. One action only means something once the mind connects that data to a desire, instinct or reason.
If sex feels better between two then it does alone, it is because external and internal reason or instinct are happening at the same time. In this, “fantasy” & “reality” synchronize for a while; “outside” and “inside” seem to be cooperating and united.
Reason always exists, whether it is subliminal or conscious. With absolutely no reason, there will be absolutely no want. All sexual preference exists for a reason.
Reason is a construct; it is web of genetic and subjective estimates – towards what will increase the chances of the survival of the species. Reason can sometimes back-fire, in the same way as a heat-sneaking missile can return to its source. Success depends entirely upon guidance.
Shame and fame and objectivity:
Fear of loosing the esteem of others [which would presumptuously mean the loss of allies in the process of survival] causes the human to develop shame. An attempt to protect one’s self from external losses, may be to “lock-down”/limit internal processes. The individual must make a sacrifice… loose or stop a part of thyself, to keep something alive outside of thyself.
[Purely]Sexual-Will towards another, within a man, is objectively the Will to give a piece of thyself to the target. Some of the body’s cells wish to be put into the body of the other, and be of some use towards the future of the species. For the male, this objective gift can be a portion of nutrients to ingest [oral], or, this objective gift can be a portion of genetic-information [vaginal]. Neither of these are theoretically an objective waste.
[Purely]Sexual-Will towards another, within a woman, is objectively the Will to receive or take.
Dominant and submissive. Parasite and host. Symbiosis. Heterosis. Give and take. Want and be wanted. Business. Trade. Etc.
Subjectively, romantic-Will is a combination of gender-roll-preconceptions, the motivational byproducts of the objective [Pure]sexual-Will, personal-needs-estimates, social instincts, learned reason, etc. There are men and women on earth who enjoy killing each other There are men and women on earth who could never Willingly hurt each other Within these two poles, there exists all degrees of Will. This also applies to romantic-Will. Romantic-Will is too multifarious for me to generalize. It all depends upon who, what & how.
Sexual-shame developed due to selectivity and defenses built around the Will to give&receive
If I may be personally-moral for a moment, I will add that all forms of sexual-body-modifications are barbaric efforts towards impressing the narrow-minded and repetitive ideas within traditions, common-beliefs and cultures; a condescending of the natural physical condition of the body; in essence, competition and stupidity towards nature.
Overcoming and curing shame – works best when one actuates what is shameful, in front of someone else who approves. Sexual acts can become very full of pride, if done inform of a group of persons whose the practitioner finds desirable, and the watches agree with/want-to-see. Example, 1 man masturbates as 10 women watch and cheer. This would obviously change is sexual-pride, especially if they talked to him afterwards about how great he looked. At the opposite polarity, 1 person is caught having sex with another which he or she was “not supposed to”, and that watchers show contempt. The end result would probably be a period of depression/madness within the ashamed individual.
Shallow and unenlightened judgment is the “reason” for unhealthy shame.
Though sex is just as natural a body-function as eating, sex is oppressed because it often requires love, piece, trust, agreement, etc. Sex can be seen as an outward expression along these lines: “I want to give.”. This is theoretically an open-gate towards exploitation and personal loss, so many persons take up the dagger of shame, drive it into their bodies and scream with a silent and subtle tone towards everyone inside of their head: the meaning of fear and danger. A sacrifice, in order to possibly make a few dull watchers realize the complexity of human need.
However sexually shameful a society is – is directly relative to how exploited, oppressed and disunited the public is.
So, if one day you should question the sexual shame that you or another has, remember the crafty and strange concept of humans trying to defeat each other Remember the cancer of war. Remember that smaller mannerisms are connected to larger phenomenons, and larger phenomenons are connected to smaller ones.