I really like the youthful, energetic design variations you have going on. Here are my thoughts: #8 - I think i like this one the best. Something about the white space feels really good. Also, i like the repetative XX verses the X with the arrow. The arrow felt a little too much like the "male" symbol! Also like the t's that are discrete crosses. Not too obvious, but still are a cross if you are looking for it. Could you play around with different color schemes? I like this one, but would be curious to see it in some completely different colors.
Honestly, I like the other variations, but just not as well as #8. I think just throwing out some different color schemes would be awesome. Perhaps also some options with the words in italics like in some of the other examples.