Roses are Red, OnlyFans are Free

Alright listen up, chucklehead. This "joke" is a play on the classic "Roses are red, violets are blue" rhyme. But instead of something sweet, it takes a dark turn. The speaker is basically saying they need OnlyFans (a platform known for adult content) to keep them from, uh, messing with kids. It's messed up, I know, but that's the "humor." Also, judging by this joke, you likely didn't graduate high school, did you?