I'm 50/50 bi, so nobody can say that I don't love the opposite sex. I just settled on a member of the same sex, is all.
My wife's totally lesbian. She's a skinny, pale, quiet woman from Siberia. Yet here she is with my chubby, farmer's-tanned, talkative, Floridian self. I'm having a very difficult time seeing how she loves "her own picture in the other person." In fact, it seems to be the very opposite. Most other same-sex couples I know are also very different from each other in some way--age, body type, temperament, culture, something.
Oh, and her closest friends are male. So much for "excludes love and care for those of the other side."
But surely Mr. Boost has conducted extensive research, right? Or, um, has actually talked with a couple actual gay people, right? Or isn't just completely pulling this out of his ass?
EDIT: Others beat me to these points and were pithier, but I'm keeping this anyway.