Some men recover the ability to ejaculate without treatment, while others may be helped by medication in an effort to regain their fertility. Most, however, will simply have dry ejaculations. As I understand it, it essentially feels the same, but without the wet spot. Some men claim that it does feel different. If you end up having radiation therapy it should not change your ability to have sex whatsoever.
Radiation therapy can, however, interfere with sperm production.
Usually the effect is temporary, and most patients regain their fertility within a matter of months. As for chemotherapy and its effects, men who receive chemotherapy for testicular cancer continue to function sexually, although some anticancer drugs interfere with sperm production. Although this effect is temporary for most patients, some may become permanently sterile. For more information on TC and fertility, check out the TCRC Fertility page . In either case, if you are receiving chemotherapy, we strongly recommend that you use some form of barrier contraception during and shortly after treatments.