
They all contain some sort of tiresome sexual innuendo.
Neither buy nor wear such a garment, unless you are attending a costume party dressed as an asshole.
Does anyone really think that members of the opposite sex will find them attractive and/or witty for donning such clothing? Perhaps. I guess if people will buy a Budweiser toilet seat, anything is possible. Actually, a Budweiser toilet seat sounds kind of fun...
The most ridiculous example of a "Co-Ed Naked" T-shirt was this one:

I suspect Dilf likes it, but is afraid to admit it to me.