I have had my arse teased and slightly penetrated many, many times over the years with various implements (usually small, including fingers and tongues!) and usually enjoyed it, but never 'gone all the way' so so speak with a 'proper' sized dildo until 2010 when Mary of Anna's Angels finally fully penetrated me.
It was a real mixture of pain and pleasure, but ultimately I enjoyed it. In fact I enjoyed it so much on my very next punt the following day with the incomparable Nicoletta I asked for it again. Nicoletta being Nicoletta was happy to oblige, so after none previously (although many near things, mainly with Amy who I've seen many times) I had two two days running.
I haven't had it since, and strangely enough on my last punt to date with Pussycatnicole (reported elsewhere) she tried it and I simply couldn't take it at all. I don't know whether this was down to technique, not enough lube or the fact that it was the first time I'd seen her, whereas I'd seen both Mary and of course Nicoletta before, I don't know.
As has been said human sexuality is a strange beast, what can turn me on sometimes does nothing for me on other occasions.
And no, I don't fancy men nor ever remotely desire a real cock up my arse.