Some school of thought believe that sex goes beyond just estacy,that it is tridimensional involving spirit,soul and body and sharing spirits.
A piece of your partner ramains with you after sex and vice versa,thats why most people find themselves thinking obsessively about partners they may not even like
You discover you begin to display certain traits your partner posses,you both begin to have simultaneous reactions and expressions.
Some couples even begin to look alike physically after a long while.
If it's really true that sex also involves sharing ,then a lot of people are already spiritually saturated,from multiple sex partners!
So the next time you decide to be sexually involved with someone,the question to ask is,do i really want to share from his/her spirit.do i really wanna have a share of his failures,challenges, life pattern etc