THis is something that I would like to try but well....never mind. I am male and it is from my perspectice.
A chastity device to keep from getting an erection.
A large butt plug inflatable would probaly be best. If it could also vibrate, better still
A diaper is put on over this and taped on with multiple layer of strong tape. Locking plactis pants over this, locked on.
over this is well a locking oneise or one of those locking suits they use in hosipals to kept people from striping of there clothes(and flashing nurces) Can't remember the name, sort of like locking coveralls or one piece long johns. Or a locking harness to lock the diaper on. all of them would be best. THe idea is to make it difficult to get the diaper off and the butt plug out
The important thing is that you have to poo (be it laxative, emema, suspository or whatever) but can't do to the large butt plug. Best if someone else as the keys or you leave the keys at home and go for a walk go to the mall, go horseback riding(with a big butt plug inside you wow) Go were all the 20 yr old hotties are, you will feel the chastity device then!
You have to go but the butt plug kepts every thing in. You are desperate and uncomfortable.
You could add to this diffferent things
womans underware under your clothes
A corset locked on of course
put on a dress over all this and go out in public (I like the idea of being out in public with this punishment) Works best if you are a passable crossdresser
Strech warp from the knee up and over the waist (up to armppits if you like) I have tried this and it is quite interesting. Add more tape if you want something very hard to get out of.
If someone tries this or something similar, please let me know what it was like.