What is Sex?

Good Question
What is SEX?
At its simplest, procreation.
Sexual reproduction...Mix and Matching genetic information.
There is A high volume of pleasure associated with the Act of Sex, therefore it can become joyously addicting. How else would mother nature convince certain individuals to pass on their lineage? If pain and discomfort were a byproduct of sex, who would participate? Sadist and masochist...and that's ok with me!
When unplanned acts of reproduction are consummated (primarily since it can be tons of fun...just ask Dr Ruth), you get adult recreational play....and that too, is ok me.
Sex now evolves beyond the basic instinctual asset that it is...
It could also be used as a tool of control and/or manipulation, depending on the individuals and situations.
There are five basic forms of sex...
1) vaginal sex
2) oral sex
3) anal sex
4) masterbastion
5) mutual masterbation

We are by design programmed to create offspring...to ensure the survival of our species.
Passing on our DNA.
It's Instinct to have sex. We are attracted to people who (through a sequence of subconscious calculations, we estimate that) would yield us viable offspring...designed to survive and last. Big tall men with brawn! To fight and survive. Beautiful women that draw a lot of mates and are protected through that male support.

It's natural why contest those desires.
My advice...
Use good judgement.
Hold good and honest intentions...
and enjoy yourself without hurting the emotions of someone you may care about!