When is a relationship moving "too fast?"?

This isn’t actually a problem but rather something I just had on my mind. I know everyone has different views on this so I wanted to see some others opinions.

Personally, to keep it short, I think a couple should move at whatever pace they feel comfortable at. If he’s kissing her on the first date and has her in bed on the second, fine by me if that’s their comfort zone.

So when do you think it’s okay to say you love someone? Okay to kiss them? Okay to “woo-hoo” (I’ve been playing too much Sims,) with them? Do you think there’s a hierarchy (Like the whole “base system,) to follow? Just what are your general thoughts?