Male friends being pervy?

I have a few guy friends and they're all pretty respectful and kind but sometimes a few of them glance at my body, even in mind convo. It creeps me out. I'm kind of curvy for my age so I'm ready to dismiss it as just them blatantly being pervs and utilizing my body for whatever without even giving a crap about actual me. It really creeps me out when they initially do it and that feeling lingers when we are 1 on 1. People who were once/are teen boys... what tf is going on here and how can I react in the best way in the future that won't embarrasse them or me?
Male friends being pervy?
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