I have used Cialis in the past, and just started using it again last night. I was given 10 mg doses, and am wondering if its too much??

Last night, much like in the past, I was able to maintain a perfect erection and managed to have sex for a good hour - and as usual, I was unable to reach an orgasm which is obviously a little disappointing to say the least! My partner seemed to enjoy every minute of it, but she too was disappointed and I'm pretty sure that she feels like she was doing something wrong (she doesn't know that I used Cialis.)

Is 10 mg too much?

Have any of you ever cut the pill in half for two smaller doses instead of one?

Thank you!!!!