"I'm pretty sure we're both negative : Like a lot of guys we don't always use condoms. Afterwards I get really . How can we be sure we're both still negative? / CHAPS, Community HIV and AIDS Prevention Strategy.

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Credit: "I'm pretty sure we're both negative : Like a lot of guys we don't always use condoms. Afterwards I get really . How can we be sure we're both still negative? / CHAPS, Community HIV and AIDS Prevention Strategy. Source: Wellcome Collection.