Re: Not being challenged as Uke?
The pin in ikkyo does not have a pain component unless you are like me and tend to find that little yonkyo spot on the back of the arm by the elbow...
If you can't get up then you tap out. Tapping out is not just for when there is pain it indicates to your pattern that the technique is complete. Very well executed pins and techniques don't hurt unless you fight them and until you learn your limits and are able to take good ukemi you should not be fighting techniques because that can get you injured.
When in doubt ask your sensei during the class so he can show you what you should be looking for and doing.