The specific reasons for the asexuality status were `` erectile difficulty '' ( 52.9 % ) , `` do not care about sexuality '' ( 53.5 % ) '' , `` no longer necessary to have sexuality at this age '' ( 47.7 % ) , `` severe stress '' ( 44.4 % ) , `` severe fatigue '' ( 26.3 % ) and `` masturbation '' ( 26.9 % ) .