A story in the Karinaverse (Traveller) Universe
After losing her virginity in a surprising quickie with her best male friend (also a virgin, and boyfriend of her best female friend), young Karina takes the opportunity to arrange a month of afterschool sex lessons with said male friend to make him better prepared before he has his first time with their other friend. Set in a variant universe of the Traveller RPG, more than 3500 years in our future.
Another of Mervin's Mistaken Identities Tales
When a group of friends are out drinking while camping, a case of mistaken identity occurs in a dark tent at night to the surprise of the recipient.