Is it normal for a guy to get hard when he hears a girl voice?

xmayax
so today I was talking to my boyfriend, and I was having a normal conversation with him in message and all of a sudden, he tells me that every time he hears my voice, he gets hard then he tells me he does not know why this happen so I'm wondering is it normal for a guy to get hard when he hears a girl voice?
Is it normal for a guy to get hard when he hears a girl voice?
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