Sex appeal is a tactic that's been used in advertising since advertising's been around. Now, how tastefully or subtly sex appeal is used varies widely.
A food truck in the UK, named Dirty Bird, blew the doors off of subtlety, at least, with the debut of its logo. It clearly resembles a ... well ... you probably get the picture.
Lest you mistake it for something else (is that possible?), Dirty Bird's tagline is "Eat Cock!". So, there you have it.
This whole sitch makes me think of this:
or, maybe, this:
Anyway, Dirty Bird is certain to ruffle a few conservative feathers, but it's gained a lot of attention, so these food truck folks might be laughing all the way to the bank.