If you are not overtly focused on finding your next long-term relationship, by all means, play around in the online dating pool. Learn some skills. Kiss some frogs. But when you get serious about finding a partner, well, set your intentions and your standards a lot higher.
Keep sex out of the game until you are sure you want to give this relationship a long-term shot. Sex clouds everything. Sex blinds us to the red flags that could be burning right before our eyes. When the sex hormones kick in we are no longer capable of making rational decisions.