[ZenGum]

Biologically, they are ready for this.

Psychologically and emotionally ... maybe. But most people do most things without being really ready for them, and survive.

Socially, it would be a boost for him, and I think nowdays for her too - provided it's just one guy.

Legally, they're both underage, but given that they're the same age, the police probably wouldn't do anything.

So, as a non-parent, I wouldn't be too worried about it, provided they are double safe - pill and condoms. Even properly used, condoms have a failure rate.

Better they are doing it in a house where they are safe than some dodgy teen hangout by the old sewage works or whatever.