What the ****? Tons of kind, pure hearted people have sex. It's a pretty natural thing.
But this is NINTENDO. They make pretty family-friendly games and TLOZ has not shown any sexual innuendos. The closest sexual innuendo that they showed in SS was Ghirahim sticking his tongue out near Link. Link, if I'm correct, has not shown any sexual behavior towards anyone, lover or not. He has not done anything wrong, he is not a mean person and he is definitely not evil. He is a peacemaker who wants to save the world. Zelda is also not a mean person, nor is she evil, she's quite a peacemaker too and never shown sexual behavior towards anyone. There are only several Zeldas that are pretty bratty and it's this game, ST, WW, and BOTW.
I don't think sex is expected human behavior, some people are virgins.