As a biker I really feel a lot safer on a 400cc sportsbike than risking it on a one-night stand bareback.
With a bike you can mitigate the risk, and can usually see the danger and take steps to avoid it.
Fully armoured and protected you can walk away from an accident that would otherwise kill or leave you incapacitated.
With HIV there are few, if any warning signs from someone who has it.