As long as a gay dude doesn't grab my ass or make out in front of my kids (Men or Women), then I'm fine with their gayness.
In no way attacking your opinion here but just out of curiosity: why don't you want your kids to see gay people making out when straight people are ok?
It would be hard to explain to a 5 year old, but I don't want straight people making out around my kids either. I actually make them cover their eyes when kissing scenes are on tv, like even on Pirates of the Caribbean, I prefer they think all kissing is gross except like a bed time peck on the cheek for myself and my wife. I'm very protective of my girls, I seriously don't have anything against gay folks, my sister in law is actually gay, like I said, as long as a dude doesn't try anything in a flirty sexual way I'm cool with it. I've had friends who are gay before and they were really cool about not making non gays uncomfortable as I was about not treating them like they had a disease, I always treated them just like another dude.
Ok, I can definitely see your point here, and I'm not trying to tell you how to raise your kids, but there are two more things I wonder about here:
Isn't it possible that sheltering your children too much could put them at a disadvantage later? Now, I know they're only five so it's not really an issue now, but would you continue doing this when they're older?
Also I want to ask if you do the same with violence? It's a stupid question, I know, but I know of oh so many parents who have huge problems with anything remotely sexual but no problem at all with even the most extreme violence and gore (hell, my parents let me watch Poltergeist at five years old and I still remember the entire movie, but I wasn't allowed to watch romcoms where they joked about or referenced sex).