Insane sexual practices
The sexuality of human beings is quite complex. Since the phase phallic as Sigmund Freud described it, the child begins to discover his sexuality and begins to explore. This is emphasized in adolescence with the awakening of the hormones, and that is something very natural. It is clear that training and information received by the individual influences much sexuality.
I agree with which human beings enjoy their sexuality provided no attempt against their health.
Particularly there are ways unusual or strange enjoy sex, which can be considered from the point of view of social and medical sick, those sexual tastes are called paraphilias. Some of these seem disgusting, creepy and repulsive, and I think that who practice them are not sane. Here you engage them which seem to me more mad and twisted:
Masochism: it is the sexual practice where you feel pleasure in giving or receiving shock, whipping, asphyxiation.
Zoophilia: sexual practices with animals.
Emetophilia: sexual arousal to be spewed by the couple in sexual intercourse.
Coprophilia: sexual arousal to be defecated by the couple in the sexual act.
Urofilia: sexual pleasure when urinating or being urinated by her partner.
Necrophilia: Arousal and sexual pleasure when having sex with a corpse.
Acrotomophilia: sexual interest in the amputated parts of a body.
If it excites you to some of these practices in my opinion you need a psychiatrist
Exciting