From biological perspective the purpose of sex is to make new humans,from spiritual perspective it is to balance energies.From simpletons perspective it is to "feel good" .
Male and female energies are different,it's like square waves vs round waves that compensate and balance each other.When those energies are out of balance then people tend to get rather emotional.Some people dont need that balancing ,they can do it naturally.They dont need outer source to get opposite energy spectrum and dont need an outlet to give away their extra accumulation of energy.But if mind/soul aint evolved enough to control the body then the body will control the mind...
Tesla consciously avoided sex all his life to conserve and direct all his energy into his mind/imagination.
Newton never got layd yet he was probably the biggest genius the world has seen.It does seem that great things can be achieved when that sexual energy is directed/transformed to mental energy.But most people just waste it and abuse it.
Orgasm is usually a tremendous waste of energy unless you dont let it leave through your legs and instead direct it out through your head.Then it will remain circling and can have an very energizing effect for quite some time.
Personally i dont feel much about other peoples relationships and what are their bedroom activities.Just like celebrity news ,i could not care less because it aint worthy of my attention.
I think it's really sad that there is such emphasis on sex rather than on building a real emotional connection in relationships.
It's because most people are selfish simpletons who are only concerned about their physical well-being.