Why shouldn't I use a disposable razor?

Why shouldn't I use a disposable razor?

It's a razor that is only meant to be used once. First of all, it's not very sharp. It's not going to give you a close shave. Secondly, it's a rigid blade. A rigid blade is not going to follow the contour of your skin. As a man you might get away with it, but, for example, if you're taking a woman using a disposable razor, they'll certainly cut their knees. They'll cut around the heels, because a razor is trying to go through your bone, and that's not going to happen.