interesting post, I too experienced exactly the same thing, the more reiki I have the more my sex drive decreases (bad English but its late here)
my reiki therapist has no answer for me but the fact others experience the same thing begs the question is this the same for all/most or are we the few who have issues in this area and the healing energy is dealing with it?
i have completed my kundalini reiki third degree and am now master/teacher. which flavour of reiki are each of you attuned to?