Back in the day (it was a Wednesday,
I don't know if you knew that), a thumbs up sign was used to symbolize the male penis. Similarly, a heart was used to smybolize the female vagina. <3 does not mean "heart" or "love", it means "vagina".
When rearranged, the "<3" sign can mean various forms of
intercourse:
3< = butt sex
>3 = ear sex