How to ask a girl to become 'exclusive' ?

boomymoon
i've been seeing this girl for just over a month now, we have a lot in common, have a great time together and have mutual interests and I can really see a relationship working between us, I told her how much I like her face to face, didn't get a ' I really like you too' response but her actions (loads of making out) sort of told me she liked me too,

she is a shy girl and being the man I think she expects me to make all the moves...(well I have been doing up to now), organizing dates, going in for kisses, holding hands etc...so I'm presuming taking things to another level

whats a good way to get into a relationship with her? do you say something like want to become exclusive etc?

or shall I wait longer till I do things like meet her friends or have sex because atm we've been on 4 dates and talk everyday, the dates just being 1 on 1 and everyone of them has been great.

idk...please help ?
Updates
+1 y
Thanks people great advice, I think I will leave it for a couple more dates..like you guys said it can't hurt! I want to tell her without being cheesy, do you think I should ask if she is ready for a relationship or just bite the bullet and ask her direct
How to ask a girl to become 'exclusive' ?
5 Opinion