They are not my thing, however they don't bother me.
However, to put a positive slant on the whole practice, I'm sure some people put up pictures of pornstars or whatever simply to help their partner get excited, get their imagination going, and enjoy the experience more.
Call me old fashioned, but putting a dick pic on your profile is disgusting and lazy. Real love means sending a bouquet of penises.
Finally, someone bringing the romance back!