There's a lot of indignant responses on here regarding the level of responsibility when it comes to oral hsv1.
The label "sexually transmitted" is applied when herpes simplex of either type is passed on during sex. Oral hsv1 is not an std, but it can be transmitted during oral sex.
Unfortunately the NHS tends to gloss over the fact that around 70% of new genital herpes infections over the last few years have been caused by hsv1, in other words, oral sex. While reoccurences and asymptomatic shedding is usually low with genital hsv1, the psychological impact can be significant, as with genital hsv1.
I had to write to the NHS a few years ago, as they were incorrectly stating that most genital herpes infections are caused by hsv2, when it is well known that hsv1 now causes the majority of genital infections. They did correct this on their website, but have failed to highlight the risk of oral to genital transmission.
I personally think if a decision is made to label something as an std then factual information and comprehensive education is really important.
Genital herpes simplex is the second most stigmatized condition after hiv, education is key to reducing transmission rates and stigma. Disclosure isn't legally required, but it's a decent thing to do, and I speak for both of oral and genital carriers of either type.
For those asking about risk of transmission, outside of an outbreak, for hsv2, studies have shown a 4% risk from female to male. Using barrier protection and/or suppressive dose antivirals it is cut to 2%. hsv1 stats are lower.