Note that an MRI only indicates the probability of having prostate cancer, and indicates that probability by assigning a PIRADS score (1 - 5). An MRI-guided fusion biopsy needs to be performed for a definitive prostate cancer diagnosis.

A PIRADS 2 means that it is unlikely that clinically significant prostate cancer is present.

Typically, a biopsy is not performed for a PIRADS 2, but it will be done if requested.

Depending on whether or not the biopsy finds prostate cancer, you’ll have a number of options to choose from.

You’re thinking about treatments way too soon. However, IF you do have prostate cancer, and IF you do choose external radiation as initial treatment, and IF you do have a recurrence (that’s a lot if IFs),
choice of salvage treatment would depend on the nature of the recurrence; there are other salvage options preferable to surgery - focal therapy (e.g., cryo), brachytherapy, SBRT, and yes even re-radiation in some cases.

(I had 28 sessions of proton radiation + SpaceOAR Vue + 6 months of Eligard with no impact on sex life. There are precautions that can be taken to minimize the risk.)