From what we see in our clinic, and what we know from the data available in the UK, women who only have sex with other women do have significantly lower rates of most STIs compared [with] women who also, or only, sleep with men.
Any contact where there is a transfer of sexual fluid with someone who has an STI, such as chlamydia, gonorrhoea or syphilis, has a possibility of transmitting that STI.
Penetrative sex is the most common way STIs are transferred, so sharing insertive sex toys or masturbating can transmit STIs.
If you or your partner(s) are a trans woman, penetrative sex can also transfer STIs fairly easily.
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