For me, I grew up in a home where clothing was very optional. I saw erections growing up and never felt threatened by them. I am however cautious about erections at family nudist resorts. I know they are not usually accepted there, even though it does happen and has often happened to me. When in this type setting I either cover my erect penis or roll over. Others here have indicated they do the same. It is not because I am ashamed or embarrassed by my erection, in fact I love the feeling of being hard, but it is to keep from offending someone else. I agree in that I think it is ashamed that many younger men may fear participating in nudist venues due to erection fear. I have often gone to an all male clothing optional venue near my home. Erections are much more common there and are never seen as a bad thing. I have been around other nude men at a guys home and erections, while not always present, do happen and seem to be a non-issue. I do know we don't shame women for erect nipples, which happen when cool or aroused and for my wife, hers look erect about all the time, even when soft. So why shame a man who has a cock that still works well and does what it was designed to do, get erect? As I said earlier, I love the way my penis feels when it is erect. I do not mind, and in fact enjoy seeing other guys who are happy, comfortable and able to be erect. So for me, if we are together and either of us get hard, so be it.
It took me a few years of going to nude beaches and resorts to get comfortable enough that the erections happen pretty naturally now from time to time. The nerves are quite a bit more relaxed knowing the environment is so chill. I see boners almost every time I'm at a nudist event and that's ok. I have also displayed one of my own from time to time.