Should I be concerned...

I was reading about the post where a woman’s husband got a boner when he was playing with his daughter (weird) and it reminded me of a time when I was on a FaceTime call with my boyfriend about a month ago and he was with his young cousin (like 8 years old) and she started touching his feet and he told her to stop and I asked him why should she stop and apparently it was an erotic place for him and he didn’t want her to touch there... should I be concerned too.