Answer:
Yes, a eunuch may be able to have an orgasm but not be able to ejaculate sperm. He may discharge a clear fluid produced by the prostrate gland however there is no desire for sex so erections are few and far between. Orgasm is'nt everything. As a gay man I find intense pleasure and satisfaction from performing oral sex
Of course,the removal of the testes does no affect the sensation on the genitalia which occurs during sex, although the individual may become sterile because of the absence already of sperm which are produced in the testes.