I don't think it's DHEA - I've been on DHEA for almost 3 months and in the middle of my first cycle since taking it. It is suppose to improve egg quality (which remains to be seen for me) but I don't think it has anything to do with "sticky-ness".

There is something called Embryo Glue (I find it googling) - not sure if this is what you have heard of. Here's an article from 2003 - Embryo 'glue' study may raise chances of successful births - Health News, Health & Families - The Independent.