I think this is a pretty complex question. Most men are not going to notice much about how a vulva looks. There is a certain type of guy who is REALLY into vaginas and those types will know. If they have suspicions, there are structural differences from localtion of the Vagina (the two hole issue that's been discussed in the past), the hood over the clit and less defined inner labia, scara, lack of lubrication, the tightness issue, et. Fortunately, these types (Drs of Vaginal Studies) are likely a small % of men.
On the other hand most men over the average 5/6 inches should know if they are bottoming out. My first bf was over 8 jnches, but he was a nice guy-he wouldn't have said anything to hurt me (still pre-op anyway, unfortunately!). To some degree I think that speaks to being intimate with a caring partner. Really that should be our goal I guess-is to find the guy who might have his suspicions, but:1 doesn't care about your past, and 2. Would not say anything to hurt you. I actually think in this area a larger percentage of males understand that we are in the general population and they might meet one of us someday. Maybe in a few more years it won't matter one way or the other.