It's not, it's just the first one.

It is the best comment!

Because it implies that she's loose.

Because he stopped in the middle of it

You know, he could have just been wearing a condom. Some guys don't feel very much through a condom, especially the "numbing" ones.

op is the girl

I get what they're saying. It makes sense if it's two gay guys and op was the dom.

Exactly

top* you can still be a dom as a bottom.

That's one possibility. Also, though, after 15 minutes, there's likely enough moisture in the area for sensation to be reduced -- especially if there was a condom involved as well. Add in an unfamiliar angle, and it could indeed be difficult for a guy to tell for sure if he's still in.