Regular customers not satisfied with tipping, want to give me the shaft as well

So I've got an issue at work with some long time regular customers of mine. I work in a restaurant, and about once a month I have a regular group of old gay guys that come in and want me to wait on them. No big deal, I'm not a homophobe so it doesn't really bother me. These guys also happen to play the pipe organ professionally which I find incredibly ironic. I've never had any issues with these guys and for the most part it's always entertaining to wait on them. Unfortunately tonight got a little uncomfortable. I was asked if the boner Ribeye (bone-in ribeye) was mouth watering delicious and was then asked if it was better than the bareback ribs. I admit that while it's funny, and I should have to followed it up with "it's a mouthful", I didn't want to encourage these guys. I should also note that this is the first time they've ever directed comments and innuendo like this towards me.

Where it got really uncomfortable was as they were leaving. The old guy who had been throwing out all the gay innuendo tries to give me a hug, which I luckily avoided because I had plates and shite in my hand. However I feel a line has definitely been crossed over which is going to make waiting on these guys really uncomfortable. Any OT advice on how I should handle this situation the next time they come in?