Can I trust my soon to be daughter in law?

I wouldn't say anything she may come from a huggy family I have friends who hug and some are uncomfortable with it it's hard when it's your son but he is a grown man hope all goes well .

not up to you to do anything about her,if you do interfere you'll likely cause a rift with your son.Nothing wrong with flirting as long as it doesn't go anywhere and no reason she shouldn't have male friends either .I've been married for 41 years and have always had male friends I find they can be far less hard work than a lot of women,who can be two faced about others in the group or bitchy.I had one friend(male ) that I had lunch with a couple of times a month and even wennt to occasional concerts With ,if my husband wasn't keen on the performer.Hasn't affected my marriage at all Try not to put your opinions on whats "right" on her ,everyone is different so let her be herself

When I was married I was regarded as the flirty one (including by his mother), my husband the quiet, steady one. I stayed totally faithful, he was the one that had an affair which broke up our marriage. So you never can tell.
We can't help feeling protective as parents, but recognise that for what it is. When my daughter got married I remember thinking to myself that if he ever hurt her or played away from home I wouldn't be responsible for my actions, and I meant it at the time!
I think you should give her the benefit of the doubt Minimo, keep your suspicions to yourself. After all, he can see for himself what's going on. If she's like that in front of him perhaps she gives him plenty of reassurance in private.