How long should I wait to have with my new partner?

I have started seeing someone who is really sweet, y and just perfect really. I have been out with him a few times now and we are going out again this week a few times, but on sayurday night we are out in town and gonna have a few drinks and he said I can stay at his place as I live too far to get a taxi home. I really wanna have with him but Im scared that if I do, he might think Im "easy" as we have only really been seeing each other for 2 weeks. We have kissed and had a little grope. Should I or shouldnt I? I really think that something good might come of this relationship but I dont wanna scare him off!