Hello there,
I can feel your pain. Well its very difficult to maintain the sexual life after prostate surgery.
Loosing the ability to have an ejaculation, and will be sterile. But you can have children with your own sperm by artificial means.
You can get full sensation of the penis with masturbation or other stimulation. You can feel Orgasmic as you said.
There is a problem with firm erection after surgery. But with robotic surgery, it can be done, but this is not the way. After few days you will get back you erection normally. But it depends upon the age and other illness such as high BP and Diabetes, older age people you know have problem in erection.
The more sexually active the person is, the better the recovery rate.
Hope you will be relaxed now.