Should mom tell about teenager’s risky business?

Dear Amy: My 18-year-old daughter and I had dinner with another mother and her daughter recently.

We've known one another since the girls were in kindergarten.

The daughters went to different high schools and aren't terribly close, but we still see them on occasion and consider them friends.

The mother and I are closer than the girls are.

Both of these girls are preparing to attend university out of state.

Away from the dinner table, in private, the other girl told my daughter that she is active on Tinder and "flirts" with an older man.

She told my daughter that this man is 27.

She says that she sends him nude pictures of herself, and he sends her sexually explicit pictures of himself.

My daughter is shocked by this.

I'm not sure how common this sort of thing is with young women their age.

Should I tell my friend what my daughter reported? I would really appreciate your advice.

Dear Wondering: If you and this other mother are close friends, then you need to approach this by asking yourself if you would want this sort of information about your own daughter. (I would, by the way.) Both of the girls are headed to college, where presumably they will each have the freedom to make all sorts of choices -- both good and bad.

As our children venture out into the world, parents should arm them with as much guidance and wisdom as they can manage.

Your daughter told you this for a reason.

You should contact your friend and neutrally report what your daughter has told you.

Be sure to tell her, "I'm telling you this because I would want to know." Do not pile on with judgment or any specific reaction — and you should leave it to this other parent to decide what to do about it, if anything.

The daughters' friendship, which is not close now, will likely end.

I hope that you and this other mother can face this challenge to your own relationship with maturity.