7 things that happen to a girl's body after losing virginity. 1/8What happens after you lose your virginity? VAGINAL CHANGES: The elasticity of your vagina changes after you start having sex. Sep 30, - Find out when most U.S. teens are losing their virginities and what factors contribute. With that in mind, the average age of virginity loss for American men is years higher for young women than young men between ages a freshman girl in college and walking by a group of older guys who.