"Friends with Benefits", "No Strings Attached", "Love & Other Drugs" ?

okay guys, is it me or do these 3 movies as listed above kinda have
the same story line ? Maybe a tweak here and there ? there's a guy and
a girl and they have casual sex but then ... oh gosh... they fall in
love ? is Hollywood running out of ideas ? hmm... wut do y'all think ?

HAVE A GREAT DAY !