"Sexy" isn't signaling -- it's a characteristic that people (usually) try to signal, more or less successfully. "I'm sexy" basically means "You want me" : note the difference in subjects :-)
If a man succeeds in signaling a high sexuality to a women, the woman might still treat him as a creep. Especially if there no established trust, signal really high amounts of sexuality doesn't result in "You want me".
In my own interactions with professional dancers there are plenty of situations where the woman succeeds in signaling a high amount of sexyness. I however know that I"m dancing with a professional dancer who going to sent that signal to a lot of guys so she doesn't enter my mental category of potential mates.
I think people frequently go wrong when the confuse impression of characteristics with goals.