Second Twin Story. During college, my identical twin brother and I took our girlfriends to Mardi Gras. We'd gotten a motel room with two double beds and were expecting some action from our girls in bed at night to cap off our drunken debauchery. After a heavy night of flashing for beads and getting drunk, we came back to the room very horny. The girls took turns getting ready for bed in the bathroom. Since my bro and I were used to it, we used the bathroom together and came out in only our boxers. It was by mistake (I promise) that we'd traded boxers in the bathroom. Little did we know that the girls were telling us apart by our boxers (cause they'd seen them while we were flashing for beads). In the dark, they led us to our beds. We were each in bed with the wrong girlfriend. Didn't stop the fun and we never told them of their mix-up. So, wearing another guys underwear can have unexpected results.