16 just seems a bit young is why, like their not much more than a child still. My step daughter is almost 16 and I think if she told my hubby she'd met and was marrying a 51 year old he'd absolutely kick the crap out of him.....................so in that case it would be hurting someone
But it is legal to marry, to have sex in certain states of the US, and over here (UK), for people to say it is creepy, borders on telling people what too do, everyone in life has to start learning for themselves you can't cocoon a person forever