I have found, when a guy cums in your ass, you feel everything BUT the spurting. You know way his tempo changes from fast to the last 2-3 hard thrusts and then he slows down, collapses his weight not to your back, and you feel his heart racing, heavy breathing and his cock soften and starts sliding easier until it slips out, you know you've just had another man ejaculate into your hole and that transaction is complete and non refundable.
You'll never see yourself the same way after that. Even if you didn't enjoy, you'll never forget the moment another dominant male fucked you. I can't say i love the sensation of being fucked, but I am totally addicted to everything that that goes with it. All those sensations I just mentioned and as a submissive male, you have offered you asshole to the dominant male to give him pleasure regardless of your pleasure. You have a tight hole available, he feels the needs one to cum in one and so you bend over and offer it to him. He takes it, uses it and leaves with his seed planted in you.