At least put in a picture that makes clear that the Gag Boobs are, in fact, breasts.

You can get it. To be frank, people are going to catch onto the fact that they are boobs easily. Anything roundish on a page called Gag Boobs is going to make you go there pretty easily and it's not like that is the bit people are going to be confused by. We know what boobs are. What we need is them clearly being used for comedy, especially slapstick.

The current image has boob slapstick◊.

You mean this one◊? I didn't think it was much of am image, but, eh, have at thee.