Our expert says:
No they are not bizarre - we just don't often talk about the range of things that can turn some people on...this range is huge and some things may be problematic, but others not. The current activity is not in itself dangerous, there is no need to put a stop to them if you are comfortable with them. If he continues to explore what excites him and this does progress to things that you do not like then it's important that you tell him and stop it if necessary.
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