Why do teenage guys only want sex?

Anonymous
For context, I'm 15 and I just met a guy through a group of guy friends of mine and we talked a bit when all hanging out together (the whole group) one night and ended up making out. I thought I was pretty clear that I'm not one of those girls who'll sleep with whoever she meets, but we went out with the group again and we were in his house alone and he wanted me to have sex with him. I had just met him a week ago, and I barely know him.
Why do teenage guys only want sex?
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