Born 1963 here. I couldn't perform oral on another man, but I might accept under the right circumstances. Mutual masturbation would be exciting I think, and I am a lot more open to that idea than I would have been say twenty years ago.
I have received enemas from another guy several years ago, no other sex involved except that I masturbated during the prostate massage after the enemas. I am more open these days to the idea of being topped now than I have been in the past. I could probably go for topping another guy but my main interest would be in receiving, which would have to be part of the deal.
For the record - my M to M enema encounter had happened when I was married, and the sex had pretty much dried up (she is deceased now). I currently have a girl friend now who will offer up some anal play on my behind now and then, including enemas.