I have two boys. They have had it well pounded into them that they don't even go into situations where a dishonest statement can possibly get them in trouble. For instance, my son never gives a girl a ride home in a car if he is alone. He does not go anywhere private with a girl. If the guys he is with are getting rowdy, he goes home.
Teach them proverbs out of the bible. They are lifesavers.
For the lips of an adulteress drip honey,
and her speech is smoother than oil;
4 but in the end she is bitter as gall,
sharp as a double-edged sword.
5 Her feet go down to death;
her steps lead straight to the grave.
6 She gives no thought to the way of life;
her paths are crooked, but she knows it not.
7 Now then, my sons, listen to me;
do not turn aside from what I say.
8 Keep to a path far from her,
do not go near the door of her house,
9 lest you give your best strength to others
and your years to one who is cruel,
10 lest strangers feast on your wealth
and your toil enrich another man's house.
11 At the end of your life you will groan,
when your flesh and body are spent.
12 You will say, "How I hated discipline!
How my heart spurned correction!
13 I would not obey my teachers
or listen to my instructors.
14 I have come to the brink of utter ruin
in the midst of the whole assembly."
15 Drink water from your own cistern,
running water from your own well.
I agree; I gave similar advice to my own son.
I was surprised, when attending the parents' portion of his college orientation, to see a rabid anti-male stance from one of the campus safety organizations. We were told that the incoming female students were being told during their orientation that all men were potential rapists, etc.
I told my son to be wary of time alone with girls because it appeared the cards were stacked against him, administratively. If the girl wanted to bring charges, she would be supported before he would. Best just to keep to group activities.
Fortunately, he selected a dorm where students agreed not to smoke, drink, or do drugs (yes, I know these are all illegal in some degree for the under 21 crowd, but you know kids still engage in these activities). It cut down on a lot of the shenanigans that young people away from home for the first time can get in to.
BTW....I suppose their mother was horrible and evil too...and your mother ...and all your sisters...and any dtrs you might have .......