Showing up nude in public where there also happens to be warm water, a good wind, and naked females romping about is going to make your son’s arousal significantly more likely. I recommend that you simply refrain from insisting to your wife that erections don’t happen at nudist sites, particularly among http://1115.us , because that statement is way off the mark.
You commented that you didn’t mention anything to your wife about your son’s erection in the water (“I never told my wife.”) The lad is very likely able to sense your requirement for secrecy in this issue and that fact alone will make http://nudismpictures.net about it, or even embarrassed.
The next time he gets an erection in your existence, be casual about it. Tell him it is part of life, there’s nothing wrong with having one, he is a totally normal boy and there is no demand to be embarassed.
However do stress the requirement to act appropriately if (when) it happens around others, by not waving it about like a huge flag and to just ignore it if he can’t easily conceal it. Not bringing others’ focus to it’s the best course of action. If someone does notice, he should stay cool as if nothing is going on.
And as one poster already implied, make sure your daughter does not make fun of him if (when) she sees him with an erection. Thirteen year old boys can be quite sensitive about those remarks.
In addition , I advise having a chat with “the wife” and disclose the information you gave her isn’t totally right. She’s going to nearly certainly spot your son with an erection one day at the resort. She must know he’s having them, and providing right information on the issue will lessen her shock and embarassment. If your wife understands how likely and regular erections are for a young teen boy, she can take it in stride when it does occur and not make your son feel bad about an uncontrollable body function.