An estimated 80%+ of people will have herpes in their life time, and it's not part of any standard STI panel. In fact in Manitoba, you cannot get a serotyped herpes blood test by request (Cadham Labs serotypes only in very specific, high risk circumstances which are highly unlikely to apply to folks here.) So if you've never had symptoms, it's incredibly unlikely that you've ever been tested, and even if you were, there's no way to know whether it's type 1 or 2 or where from the body the virus might asymptomatically shed from.
While type 1 typically prefers the trigeminal ganglia and usually appears on the face, and type 2 typically prefers the sacral ganglia and appears around the genitals, buttocks and thighs, with oral sex moving from being kinky to being standard fare, up to 50% of new genital herpes infections are type 1.
Asymptomatic shedding can be reduced with daily suppressive therapy (valacyclovir.)
When doing risk assessment around sex, your best bet is to proceed as if you and everyone else has it, because odds are, you do. Use condoms, maintain your overall health, avoid coming into contact with any blisters or sores, avoid contact if you're having an outbreak, but don't stress out about it too much.
With regard to HIV, if someone who is HIV positive is taking ARVs and their viral load is undetectable for six months, they cannot transmit the virus.
http://blog.catie.ca/2017/01/13/undetectableuntransmittable-catie-signs-on/
Obviously you should still always use a condom for PIV and PIA (oral transmission is already low risk, even with a detectable viral load), and if you're particularly concerned about HIV you can talk to your doctor about getting on PrEP (pre-exposure prohylaxis - a daily pill for people who are HIV negative, to prevent acquring the virus.) But it's not the 80s any more - HIV is no longer a death sentence, and there are lots of tools available to prevent transmission.