Do guys know their own strength or do they have to be told?

Ok so a little backstory to this is that last night a guy friend and myself were play wrestling because we were super bored and just got done studying for one of our midterms for one of our college classes we have together. Anyway, while we were wrestling, he grabbed my arms a few times, and it hurt quite a bit. I just let it go and didn't say anything about it because I didn't want to ruin the laughs we were getting out of it. However, I know have bruises all up and down my arms. What I'm asking is, do guys know their own strength or do they have to be told? And if guys do know their own strength, then was he just treating me like one of his guy friends that he would wrestle?
Do guys know their own strength or do they have to be told?
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