i've gotten that comment many times. just depends on the situation. one time, the girl was walking semi bull-legged at work the next day and told me she was sore. thought that was funny and made me look good since she told her friends.
my girl right now gets sore frequently even from "regular sex"; but that's because she has a tight asian pussy. kinda sucks sometimes because she'll do the "running away from it" thing. especially doggystyle. i usually don't let her by holding her hands down, or holding them behind her back during doggystyle. ironically, she gets really wet and usually comes when i do this. i think its the whole dominance thing and the fact that deep down inside, every girl wants to get the daylights fucked out of them every now and then.