I recently heard this idea of how you should know if someone is 2nd date worthy and I liked:
1. Contemplate if you had fun! Lets face it, life is short. If sweetness and joy where not a part of the mix in this person's company why would you spend anymore time with them?
2. Is he/she attractive enough to sleep with. It doesn't mean you need to give it up on the first or even fifth date, and at the end of the day we are animals. Attraction, chemistry, and lust are real. Its true that attraction can grow and develop, and a little spark of (insert sexy rolling rrr here) is a wonderful place to begin.
If you are already in a relationship go out on a date and HAVE FUN! Then go home and ignite your attraction for one another in a new and refreshing way.