Androgen-deprivation therapy is also known as "ADT" or "hormone therapy", and there are several different types used for prostate cancer. All are likely to affect your libido (your desire to have sex). They are also likely to affect your ability to get and maintain an erection.
Androgen-deprivation therapy can also cause your body shape to change. For example, your breasts might enlarge and you might get a more rounded look. There are treatments available to minimise or reverse these effects, so speak to your doctor if this concerns you. Another possible effect on your appearance could be the loss of some or all of your body hair. If body hair is part of how you see yourself sexually you should ask your doctor for more information.
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Sources: This information is based on details contained in "Prostate Facts For Gay and Bisexual Men" published by Prostate Cancer UK and on the personal stories of some of the men attending the monthly meetings of the LGBT Walnut group.