Showing up nude in public where there also happens to be warm water, a good breeze, and naked females romping around will make your son’s arousal significantly more likely. I suggest that you refrain from insisting to your wife that erections don’t occur at nudist sites, especially among teenagers, because that statement is way off the mark.
You commented that you did not mention anything to your wife about your son’s erection in the water (“I never told my wife.”) The lad is extremely likely able to feel your need for secrecy in this issue and that fact alone will make him uneasy about it, or even embarrassed.
The next time he gets an erection in your existence, be casual about it. Tell him it’s part of life, there’s nothing wrong with having one, he is a totally ordinary boy and there’s no need to be embarassed. However do accentuate the need to act appropriately if (when) it happens around others, by not waving it about like a large flag and to just dismiss it if he can not easily hide it. Not bringing others’ focus to it’s the top plan of http://nudist-picture-club.com . If a person does notice, he should remain cool as if nothing is going on.
And as one poster al read y implied, ensure that your daughter will not make fun of him if (when) she sees him with an erection. Thirteen year old boys may be very sensitive about those comments.
I also propose having a chat with “the wife” and declare the information you gave her is not completely correct. She will almost certainly spot your son with an erection one day at the resort. She must know he’s having them, and supplying right info regarding the issue will decrease her shock and embarassment. In case your wife knows how likely and regular erections are for a young teenage boy, she is able to take it in stride when it does happen and not make your son feel bad about an uncontrollable body function.