Girls, my girlfriend and I went to a nude beach and she got upset when she saw me get hard for a chick with a huge ass in front of us. can you help?

I think she is overreacting but took offense since I visibly got hard seeing a huge naked ass in front of me. She has to realize that’s normal. How would you react?

Girls, my girlfriend and I went to a nude beach and she got upset when she saw me get hard for a chick with a huge ass in front of us. can you help?
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