So, having discussed this with at least one other ENFP i thought i may seek further insight.
I would have poss posted in the NF forum but it seemed clogged with intj nonsense.
So, the ISTP, i find, has a strong sexual intensity about them. It may come down to instinctual variant/eneagram but damn you guys are attractive.
You do seem to have this ability though, the no strings ability, which i find quite scary... the start up chase process can be misinterpreted as "oh, ok, this is casual" leaving the (enfp?) hesitant or fleeing.
I'm rambling a little, i'd be interested to hear others opinions on this, especially ENFP's and ISTP's.