Depends on guy.
Have had 3 experiences with men. Rest female. Have a little pansexual side to me. The 3 experiences just kind of happened.
The stars aligned with their personalities and endowment. I have a "want to please" attitude in bed. Thus, I was fortunate.
I did take it from one of guys. He was perfectly endowed for said activity. I really enjoyed it. Given what I was doing there was some discomfort but not too much.
Another one of guys was on the big side so I am fortunate he was into sensuality activities. If he was wanting more I would have been in a quandary.
The third guy (second of my three) was just ridiculously large. He was hung just like Jeff Stryker but a little shorter, thicker and his penis was straight as an arrow (versus the slight downward curve). Thankfully he was in the 50% of "gay" guys that was not into anal stuff... sensual stuff, touching, oral, et al.
All three were perfect and wonderful encounters.