make her get a ring tattoo, ao you will always know!!

I thought the rule was identical twins was that since, genetically, they are basically clones, they count as one person? This is the only rational reason I can think of that you could argue for the infamous "twin threesome"....I clearly need new friends and more fresh air, lol, I am thinking about this too much. Also I'd suggest a Tattoo you can both share and just special between YOU TWO only and so you botyh get it and an indelible mark. Or just trust your soon-to-be wife? :) xxxx

I think you should tell them to stop. I don't think it's fair to your guys' relationship. Good luck though.

Reminds me of these twins I used to work with. They'd dress in similar outfits (same clothes different colors), had the same hairstyle and arrived at work at the same time. I always thought it was weird. How could anyone truly tell who was who...FYL OP

Wedding night: "Hey, your pubic hair is growing the opposite direction since we last had sex."

Who cares which one? Looks like you're pretty much getting both anyway. You are one lucky man! (unless these twins of which you speak are fugly)

I'm not saying it would be an excuse for cheating, I'm just saying it's not your fault if you don't know. ;)

Marry both see what they say then :)

When they're playing this trick on you, reach for a boob on each one. Which ever one pulls away is not your fiancee. If neither one pulls away, you're about to have an amazingly good time.

I imagine the sister doesn't have an identical engagement ring on her hand. Or does she let her sister wear it to **** with you?