Don Corneo literally jumps on Aerith/Tifa/DragCloud depending on who was picked. He is obviously intending to do something naughty. He kidnaps Elena and Yuffie with the same intentions. Yuffie is 16 which makes the Don a pedophile.

I believe there's enough implication that Zack and Aerith made whoopee, Biggs and Jessie, and very likely Hojo and Lucrecia, though who really knows how he implanted her with the hellspawn of Jenova.