As for the number of dates it takes, I think exclusivity is dependent upon each couple. For myself, I will date a partner for a while (no set dates) and see what develops between us. You will know if there is chemistry there or if there is something you want to pursue with the other person. Hopefully, you are talking openly and honestly with each other and the subject of where you are going together as a couple should be a topic that comes naturally. If either party is hesitant, talk it over and decide what the next step is in the relationship. One of you may be more ready to date exclusively than the other. Doesn't mean the relationship is not worth pursuing, it just means that maybe more time is needed for that person. I think you should definitely define what the relationship status is beforeintimacy is shared between you. If you are on different pages, then each partner has a chance to decide what is right for them as far as going forward in an intimate setting.