Yes, when people first see other nude people they often get aroused, because nudity is linked to sex within our culture. You hardly see naked people outside of porn and sexual encounters, so your mind gets aroused anytime you see nudity, like you would get aroused by eating chocolate if you ate chocolate every time you had an orgasm. But as anyone who's ever spent time at a nudist retreat can tell you, that goes away as you get used to seeing people as they are.