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Most straight women and most straight men have an alarmed and upset reaction if they see an unexpected penis while going about their day. I don’t see this as being a gendered thing at all, although some of the details of the nature of the alarm are gendered and could even involve homophobia, it’s mostly just that suddenly seeing a dick is most often a negative experience.
I literally don’t see anything about this that has to do with sexuality in any way, it feels like you’re just trying to shoehorn that in there.