Late but; the part of the body that controls ejaculation is not actually in the brain, its in the spine. A dude who gets decapitated can still ejaculate.
The ears are an erogenous zone
Can’t remember the source, but I heard that long-term sex partners actually prop up each other’s immune systems. If one person has immunity to a certain bug, the partner will gain immunity through the sex, without actually coming into contact with the disease themselves.