Why are these other commenters getting so uppity huh? D: You don't literally have to have slept with lots of people to be considered a manwhore. He loves the attention and has kissed/made out with/flirted with just about every adult female character on the show. Hell, he even had Rachel after him for a while.

I don't think it's a bad thing really, I find it to be an amusing running gag. Tbh, I was a little disappointed by the shirt he chose, though the phrase from this secret wouldn't necessarily have been my first choice either.