it might just be a placebo effect. if not there is some explanation to this. i personally have never had a noticable increase in sex drive from taking it but then again, when iwas taking it it was to restore natural test levels to what it was before. in your case since u only did an anavar only cycle the anavar probably didnt affect your natural test too much. so when u started with clomid, it may have blocked some of your natural estrogenic effects while at the same time stimulating your body to produce more tetosterone which would increase your sex drive