Laophraig - Completely unnecessary - ask yourself why you feel the need to take such an angle.
In relation to PREP - NHS i believe it may be expensive, though I understand a recent court ruling may have made it soon to be free?
There are also seemingly legitimate PREP site (
https://www.iwantprepnow.co.uk) - I think your view Fred makes sense, especially if you could get generic cheaply. Not sure about long term side effects though.
Red - yep, that makes sense also. Many STDs out there. I was just thinking should it be the norm (if affordable) and then risk is lower.