If a guy gets hard around you does that mean he wants to hook up?

so I’m really curious about something and it may sound stupid but if I guy gets hard at the pool when im in a bikini, does that mean he wants to hook up or does it just normally happen? The first time I noticed I played it off but the 2nd time I made it very obvious I was looking at it and it went away so I’m confused
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+1 y
maybe i should have rephrased the question to "What does it mean if a guy is hard but then once he knows I see it then he looses it"
If a guy gets hard around you does that mean he wants to hook up?
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