[tropo]

None of that is essential.

For menstruation, you can do free bleeding.

For defecation, you can use a bidet, or go old-style with corn cobs. You can use an odd number of stones, as specified by Muhammad.

The same goes for shampoo (don't need it), deodorant (don't need it), and many other things.

What this all boils down to is a fear of having other people think you are weird, defective, dirty, gross, etc.