I add myself to the list of women with fantasies about men dominating men. I revelled in such scenarios long before I had a clue about sex. As long as there were guys who got tied up / scared / imprisoned / enslaved / etc., I did not care much by whom. As long as there was a man who dropped to his knees, I did not care much before whom.

Some contributors to this thread have mentioned movies... I even found the incredibly silly torture scene between Count Rugen and Westley in 'The Princess Bride' quite sexy. Not to mention the first scenes, when Westley gets ordered about by bossy Buttercup and always responds with 'As you wish'. Sigh. (Later she gets kidnapped and tossed around like a parcel: yummy for those with M/f interests. If only there were some F/f action included, this film would almost have something for everyone.)

Now that I am older and know some more about the anatomical bits and operational dynamics, my fantasies about M/m domination often feature men having sex. Very enjoyable.