Relationships and Sociology

Hello everyone,

I'm in a bit of a pickle.

I keep finding myself in beginnings of relationships where the man wants to wait to have sex. This is always unexpected on my end and it becomes frustrating the longer it goes on. It's occurring so frequently I'm beginning to think it's normal. Personally, I'm not a fan of it.

So questions:

Why would you wait to have sex in a relationship?

How long would you wait? Why that amount of time?

At what point is too long and would be reasonable to...