What he was talking about was you dont want the males cuz there no good unless you plan to make hash or something becuase all they do is pollinate the female plants creating seeds n that could ruin ur whole crop of females if u dont want seeds and for your plants being to tall im not sure if im correct so cyclonite correct me if im wrong...you could try training the plants by tie them down or bending and as for your friends you got the seeds from you cant tell if there males or not untill you switch the lights to 12/12 and it starts to show signs of sex etc. females will have buds or start off as lil white hairs and males will have balls.If you uploaded some pictures we would be able tohelp you out some more on the sexing part of it.