I have tried to it keeps saying the item which idk what he meant so I just throw it out which ended up me going to prison 

For short...

You can't sell Sexbot Part. (At least for Version 0.90.15)

You can only get rid of them by throwing them out safely.

How to throw out Bot Parts safely with no consequences/How to start BigDaddyHurt's Storyline :

1. Try to throw out any Bot Part.
2. Anon hesitates whether he should throw Bot Parts out or not.
3.  Choose "Don't throw it out"
4. Anon will think of someone who could help him. The name of the person is "bigdaddyhurt"
5. After you input his name, Anon will think about a way to contact BigDaddyHurt.
6. Order anything from BigDaddyHurt's Shop
7. After your Order arrived, check your inventory for an item called "Lingerie Catalogue"
8. Use the "Lingerie Catalogue"
9. It will tell you to "Go for a walk around 2 AM"
10. After around 2 AM, go for a walk, and you should trigger BigDaddyHurt's Event.
11. After the Event of meeting BigDaddyHurt in person, you can now throw out Bot Part with no consequences, and you also unlock his storyline.