What FermatsTheorem said
It needs to be advice for women who ONLG have sex with women as surely they are at lowest risk for everything.
Women who have sex with women might not be as at much risk of STIs as women who have sex with men but many STIs are passed on by other means than PIV or PI-any-orifice sex so there is not no risk, as Anne Lister discovered when she picked up an STI from one of her exclusively female lovers.
Women who have sex with wonen as well as men should follow the advice for women who have sex with men.
And how does this help those women when assessing risk re sexual contact with females?
The terms "men who have sex with men" and "women who have sex with women" are used by sexual health professionals exactly because they end up seeing so many patients who identify in a certain way, e.g. as a lesbian but who seek help and advice when they have sex with men or as a heterosexual man but who has sex with men.
Women who identify as lesbians occasionally having sex with men is not uncommon, just as straight men having occasional sex with other men is not uncommon.
A significant reason that this does not get discussed within lesbian circles is because of prevalent beliefs within the lesbian communities about categories. Basically many lesbians believe that if a lesbian has sex with one or more men that she is no longer a lesbian.
I am not talking about sexual relationships prior to identifying as a lesbian, but sexual experiences after a woman identifies as a lesbian.
Surely it is not difficult to understand why so many women who identify as lesbians keep very quiet about sexual relationships with men?
It is unsurprising that these terms are used in the context of sexual health as, no matter how anyone identifies, if they are concerned about STIs they will visit a sexual health clinic and be encouraged to talk truthfully to a professional whose job it is to assess and test them for STIs and to do contact tracing if appropriate.
People who do not work in the front line of sexual health can opine about what makes a person gay, straight, lesbian, bi or whatever, but people in sexual health professions are uninterested in challenging patients about the definitions of what constitutes a lesbian, gay, straight or anything other sexual preference.
A professional stance requires a sympathetic, non-judgemental (within legal boundaries) stance and appropriate testing, counselling / advice and contact tracing.
I can understand why some women would pull out a dictionary and say “there you go this is what lesbian means” but if they had ever worked in a professional capacity in a sexual health setting they would know that how people identify and what they do sexually are often completely different things.