There is no difference between a person who has had sex and someone who hasn’t.
Even a woman’s hymen is no demarcator of virginity; many will rupture their hymen long before they’ve had penetrative vaginal intercourse.
For some, it’s a quest to lose our virginity the night of The Big School Event (Homecoming, Prom, Spring Formal, what-have-you) because it’s part of the modern high-school mythology that we’ve made up.
For others it’s trying to beat a particular date – our 18th or 21st birthdays, high-school or college graduation, before summer’s over, before getting married.
We are taught to measure a man’s value by the number of sex partners he’s had; the more women he’s seduced, the greater the value.