So then, how does sex happen? (Or any intimacy.)

That's the bit the old people don't understand.

Board games are fine, as would be video games in the same room as the other players. But online?

Note that the same worry would apply to a youth who spent all their free time reading alone in the past.

Sex wasn't exactly supposed to be happening in past generations of teens. One of the reasons people sometimes had their first sexual experience in cars was because both sets of parents would block it at home, and they couldn't rent a hotel room.

My high school apparently got complaints from neighboring homes that students were having sex in their bushes.

So, yes, changing social lives may be an issue, but it doesn't seem like it was easy before.

It does not. That's why we have a massive drop in teenage pregnancies.

I disagree, kids have more access to sex education than ever now and tinder is a really good tool for hookups. They just know to use a condom. I remember my dad thought that if the woman was on top and you came inside her she wouldn't get pregnant because of gravity, 9 months later I showed up. Thank you catholic school for only teaching abstinence.

Online, like it did on IRC? ;)