GlaxoSmithKline doesn't need to release the results. If it is shown that there were a very high number of users with side effects (as I would guess is the case for younger men) and that it isn't likely to be approved, then they may choose not to release the results because it would look bad. If I remember correctly they never published the side effects for the Phase II trial either.
It is also possible that they are just taking their time. It's not likely to be approved in the US for years, if at all, so there is no rush for them to release results.