I've been on and off of masturbation, and I realize that it's a drug, essentially.
I also think that love is something that makes that energy go into the one you love through an intimate connection if it's properly done.
The other interesting thing is that it takes a lot of energy to make semen. Glands are working at a very high energy level, and the pleasure centers are all using tons of electricity and chemical resources as well. An orgasm is more than just an expenditure of energy... It's a manufacturing ordeal.