SEX FILES

Is there any way to tell when I meet a girl whether or not we’ll have good sex? I’ve met girls I think are smart and attractive, but when we’re in bed we just don’t have that spark.

DEVON H., PORTLAND, ME, USA

▪ There’s not much you can know about sexual chemistry without having sex. You can’t judge a girl’s sexual prowess by how she talks or flirts.

But if there’s any somewhat reliable indication, it’s good, old-fashioned kissing, which is way more important than it’s given credit for. If you feel she’s a bad