I was pretty much having the same thoughts as you - only in my case was interested in the Bi side of myself - this led to more thoughts of sex with a man, and was definitely a departure from my usual sex with one of my female partners... The way I approached it was to heighten the eroticism by wanting a long process of enemas and anal play, and the anal sex would be allowed to happen if both my partner and I were erotically enthused enough.
So we figured at least a few hours of play to start... taking each other over each others' lap as we took each others' temperatures, explored each others' asses as we lay across each others laps, loving the feel of having our cheeks and anuses played with, insertions done, and plied apart; finally having the necessary three enemas to clean each others' deep recesses out; then finally, after some rest, as we lay side be side manually stroking each others' cocks, by the time we did all that prior activity, and not letting our cocks cum manually, our anuses properly loosened, we were pretty much ready to take the final step of having a man's cock in our asses.
With all that prior stimulation, both of our first "entries" was smooth and easy... Wrapped in a condom of course - lube and condom made the entry so slick and easy... and then having our hard cocks rest in each other before moving them to start having them build to a final climax - so easy and so good feeling... nevertheless, all the above had a lot more detail to it - but I wanted to let you know that it might take some fun build up of sexual pressure to make the mutual anal sex a terrific, welcoming, experience; and one that you might want to try again and again because of the sheer enjoyment of it; of course having one guy that you trust makes it so much better.
My guy sex partner and I have done this enough times now that we are going to take blood tests to be sure we are disease free, and then we are going to try the next step, anal sex barebacked, as we now want to experience the feel of having each of us cum inside each other - when that happens, I'll post some detail about that.. In the meantime, good luck with your experiences.