Good question, Bettina. My understanding is that Rachel is/was a transsexual so if he became a she, I don't know whether you would classify that as a gay relationship. But I don't know much about Rachel, who she was before she changed sex or met Lou, what became of her after they split in whenever- 1977?- think I might have read somewhere that she is dead. But I don't know. It would be interesting to know and to hear whether she has anything to say about her time with Lou- closest thing to a soulmate that he would appear to have had from the biographical details I've read, until Laurie, of course.
Think Andy was asking more about gay relationships with more celebrity-type folk like Warhol/Bowie/Jagger. But,anyway, to the best of my knowledge, he's been strictly hetro since the Falk affair (if that even really happened).