Love.
Speaking on the subject of love, love of the people there are many forms such as love, animals, objects, places, or other human love doesn't have to be twin girls with man. Only love, no need to limit sex, just caused a sensation of a couple who satisfied mutually. May be gay, a woman who likes women. Or other people. Don't have a girlfriend, but show the love from something else, such as friends, family, pets, just be happy with it. Okay.