Anal, every man dreams of it one way or the other. Either they dream about giving it, or, they dream about receiving it.
Most of the time, when a man dreams of giving it, they want to bend the woman (or man) over, spread those nice, ass cheeks, and drive his cock, forcefully into her ass. Pulling her hair, yanking her back by her shoulders, fucking so hard his balls slap on her clit. Yes, he wants to pop his load inside her ass too, that just goes without saying.