Looking for a genuine intellectual discussion about this. Historically it seems obvious that the reasons are
a) men/young men (boys) are bigger, stronger
b) women are smaller, less strong and more likely to be responsible for caring & looking after children/ elderly parents
BUT
In the world we now live in surely male conscription is sexist and raises all sorts of issues:
- should young women be conscripted too?
- should transwomen be conscripted?
- should transmen be accepted as conscripts?
- could a man identify as trans to avoid conscription?
- in same sex couples with children should one partner care and one be conscripted?