I'm not sure but I can tell you that my bf for a few years now really likes this new lubricant called ready lube. It has a couple aphrosidiacs in it like yohimbine and ginseng which are there to help stimulate more blood flow thus creating a bigger harder erection.
we really enjoy it a lot and I remember that when I was first looking for something that my bf would like as much as I did, ready lube was an easy choice but it took a lot of research finding it, ie- a good lube that worked.
My bf hates those lubes that make him smell like a strawberry all day or whatever lol so that's partly why he likes ready lube so much because it has no color, taste or smell!
Anyway...Just a cool tip for all you men out there! Check it out :)
later!