Sexual intercourse is not something to publicize or to show to everyone. That should stay behind closed doors.
This was taken from a website interviewing Chaim Ben Pesach and I feel that this quote somewhat pertains to the subject. Although I don't know how...
"I get the impression you spend all day on these issues. What do you do to relax?"
This is my life. To me, relaxation is when you achieve something for the cause. Achieving things for a good cause is for me the real exhilaration of life. When somebody does something sinful, whether sex or drugs or gambling or whatever, the enjoyment from that doesn't last. You can't say, "I smoked a joint yesterday, and it was great. Now I'm contented." You have to smoke another joint. The same thing with sex or gambling or anything. On the other hand, when you achieve something good, that stays with you. And G-d gave us the ability to understand that that is true happiness: accomplishing great things for a noble cause."