I like it

Innocent looking enough that if you wear it out in public most people passing by wouldn't give you a second glance. Just another guy in a weird t-shirt.

But if a stranger happens to know the meaning behind the shirt, you'll be able to tell immediately by his/her look when he/she sees the shirt.

Would they try to strike up a conversation their fellow pervert, or would they just turn and walk away like they didn't see you?

I think I'll order one just to find that out.

[edit: I typed "be" instead of "order" in the last sentence]