If nothing else this thread made me smile!
I guess its ok to get nude with your mom's friends if they all get nude first - and it is something you want to do...
We in the west would consider such behaviour as strange, though I have heard rumours that such goings-on were quite normal in East Anglia (a region of the UK).
I don't know if mothers fondling the genitals of their sons is usual in other parts of the world...
I have to say it sounds wierd, as though it should be fun, but probably isn't and is a radical way to cure a young fellow of embarrassment, though it might give him confidence - or it might not...
Its all a bit close to that religious, and more recently legal, taboo of incest that most people refuse to discuss openly.
At 17 it couldn't be child abuse in the UK but I don't know about other parts of the world...
As for incest - for those in the know it isn't the least bit shocking. Relate, the UK relationship counselling organisation, stated they believed there is at least 50,000 perfectly satisfactory incestuous relationships being carried on in the UK at any one time and the only ones brought to public attention are a very few that went wrong - a better record than with "normal" relationships!
One thing is certain - with so many illegitimate children in this country, so much sleeping-around and so many kids that have lost touch with natural parents and so forth, that figure is increasing all the time...
Very few men can know exactly how many children they have fathered and consequently fewer people can say for certain they aren't sleeping with a close relative...