When you're ready. There is no one-size-fits-all answer. I'll be 19 in 6 days and I'm still a virgin. I've also never kissed a girl. I'd like to wait for when/if I get married, both for religious reasons as well as political. Regarding the latter, in California due to radical feminism, there are a lot of matriarchal laws regarding sex that can have adverse repercussions for a man, even if the girl consents. Just see "Yes Means Yes." You are virtually Guilty Until Proven Innocent. I don't want to end up in jail because a female who had a drink or two regrets it the next day. I'd rather avoid the trouble and just wait until marriage.