Why would a guy friend say on the phone “if you hook up/kiss a guy I want you to be honest with me” when I told him I got invited to a guy’s party?

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He then said I’m going to hang up now because I might say something stupid and then hunged up on me? What stupid things is he talking about?
Why would a guy friend say on the phone “if you hook up/kiss a guy I want you to be honest with me” when I told him I got invited to a guy’s party?
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