Teenage boys can get an erection if they have even a slight passing thought about a girl they like. Teenage boys and their erections are a force of nature, something they don't yet control and generally happens at the worst time possible.
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Yes, it's possible for guys to get erections when they see someone they are attracted to due to physical and psychological arousal. Attraction and desire can lead to physiological responses in the body, such as increased blood flow to the genitals.
unless she is a model.... probably not, if you saw her in a bikini or bra and underwear or naked, yes. you would if you saw any girl naked also.