As a guy I really do not have any cleavage.  I do have some boob flesh from being a little over weight but that alone does not give me any cleavage.  I so want to wear something thet is slightly low cut but can't.

 I tried one of those stick on bras one day.  It took a bit to get the hang of it but once I hade it on, WOW!  I started to rock cleavage!  It looked great!  Now I put on the stiock on bra, then a front close bra wth my breast forms and I can wear a blouse that it slightly low cut to show off.  It looks really hot.  I love love love it.