Can I marry someone just because I want someone to be intimate with?

Then after you're intimate with them, then what happens then? So there are a lot of things you need to take into account with a marriage. It's a lifelong process financially, for example, in terms of their personality, in terms of your setup, in terms of your goals, your aims, children, etc. So take all of that into account, not just thinking with one part of your body.