So, once you let the cat out of the bag.... do know, that the GIRLS will HAVE TO SPEAK up too... and not change their story about it, once everyone knows.
If they get scared/embarrassed once you tell the parents, then, they may get cold feet. As you said, up until now, they were "afraid" to say anything.
So, when did this happen anyway? Yesterday? 10 years ago?
And, how did your friend's Husband, attempt to sleep with your oldest daughter's underage teenage girlfriend? That girl had a play date/sleepover at their house?
IN any event, the guy is a scum and was trying to victimize children. And who knows what else he has done, or tried to do, and probably online stuff too. This is rarely just a single incident... but a mode of behavior and habit.
AND the girls, will have to.... once this is brought into the open, TELL the Police or other parents, what happened. WILL they do this?
If not, you don't have anything to stand on.
And if, this woman friend you know... has a daughter or daughters... I would hope that their Dad is not molesting them, or taking peeks at them while showering etc. or other disgusting things.
If you tell your friend, then you better make sure, that you stick to it and to the end, even if this creates drama and discomfort for you.
That woman friend of yours, should know.
What if her daughter(s) or their friends, are being hit on by the Husband? And he is having affairs... and bringing STD's home, to his Wife/your friend? That is another ramification.
Many ramifications here.
But the thing is, this guy tried to victimize, children.
That is a whole other ball game and level of wrongness.
Wouldn't YOU want to know, if this were you?
Children, need to be protected.
HOPEFULLY, he has not ALREADY victimized a child.
And he has already probably, have had affairs. Hitting on you, was not his only attempt. He probably has a long history of this.
This guy.... hits on adult women, and is hitting in CHILDREN.
And if they have play dates at their house... then can you imagine... this guy, checking out the girls and who knows what else???
Isn't that enough, for you to speak up?