Mithras Actually I wouldn´t call it double standards but different philosophies.
Well, he is right, evidently it is a double standard, or as you say a different philosophy.
As for sexuality, in many of our families, female sexuality is given much more importance than male sexuality.
It is not that boys "should" masturbate, it is just something that is difficult to control, and it is not really important enough to take other measures.
Regarding the use of the chastity belt, here I see a misconception: the term punishment is used, and it is not at all, or not for all. For a woman, for me, my mother, my sisters, wearing a belt is a source of pride and satisfaction, not punishment. Mothers wear it because they are women, like daughters, there is not much difference... except in the conjugal relationship, (which is already a huge difference), but anything less than that is not justified.