Actually, the other way 'round, Ssmall. I think Deltas are going to be the choosiest quadra, since the STs want stable relationships and the NFs are perpetually in a grassisgreener mindframe (though how EII Ones approach this, I'm not sure?)
Whereas, I suppose, Alpha irrationals sort of expect turmoil and just hook up with whoever gives them good Fe.
As an Alpha rational, I would say, I'm very picky... but only in my mind! I think ESEs are naturally inclined to have sudden intense infatuations, especially since we're Caregivers (shallow bastards ) and Fe-base (very easy to energize/mobilize). I pretty much need to be in love with someone or something, or I just feel lost...