Me and my partner have a cat, she is normally a very quite nice cat right up until we go to have sex.
If we shut the bedroom door she stands in the hall scratching franticly to get in.
When we give up on keeping her out or forget to close the door she comes in and climes up onto the top of the DVD rack that is about level with the top of the bed (she never gets on the rack unless we are having sex). Then she watches as we go at it.
Is it normal for a cat to be so fascinated with gay sex
For another, I don't think this is an issue of gay sex, per se. Cats are very instinctual, and nearly every household pet is going to be somewhat interested in two people, whether they be homo- or hetero-sexual, having sex.
(im a guy)