why do it again...and again...and again.... well because it feels fantastic topping a nice male ass.
Why because I'm top and thats what i do, a bit like asking bottoms why they bottom, its just what does it for me.
how does it feel, different with each guy, depends on their build and how tight they are, but feeling your cock press up against their hole, feel it open and give way to your head, feeling that initial tightness and then relax as you enter and the guy relaxes and lets you in, feeling your length go all the way in, the warmth, squishiness, the tightness still of the sphincter around your cock. Its like a warm mouth around your dick's whole length.
As you fuck you can feel the heat and the spasming of the guys body, you know that you're doing that to/for them and you hear them moan and getting off on your dick in them.
If you're with a great bottom guy, that can control their muscles well, to squeeze, release, hold and massage your dick with their ass it feels amazing.
Seeing your guy riding you, eyes closed, head back, ecstasy on their face and just enjoying you in them is a amazing to see and great to feel.
As the bottom guys cums you feel that immense tightening inside of them squeezing your dick and you know that you've done a good job and they've enjoyed the experience.
Being in a guy you feel trusted, that this person has allowed you inside of them, if barebacking that they've allowed you to cum inside of them, its just incredibly intimate, as close as two people can get to being part of one another.
It also of course a very physical thing by its nature, one guy is penetrating another, the top is usually doing a lot of the work so it is physical, needs stamina, and does take a certain skill on the tops part for the bottom to fully enjoy it and you do literally feel drained after a good session.
I think there is also a mental aspect to it as well, for two guys fucking, just as a lot of bottoms describe bottoming as more mental, the 'giving' oneself to another, i do think there is an element of that for all tops too the taking or 'owning' of that guys ass.
But yes its very physically enjoyable indeed ;-)