Guys, Why does my boyfriend get hard so easily around me?

Today my tampon kinda got stuck so my boyfriend helped me take it out. He got hard when I pulled my pants and underwear down, for him to help, me even though this wasn't a sexual situation? I don't get it we weren't doing anything sexual... I wouldn't get wet if I had to help my boyfriend with something down there 😂
Guys, Why does my boyfriend get hard so easily around me?
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