Sex isn't something you have with just anyone you meet the same day. You'd want to get to know the person first before rubbing your genitalia together. Good news is that CRISPR could be the best way to cure HIV since all Virus's do is change the DNA in a cell. You could in theory change the DNA again with CRISPR and cure HIV, but who knows when we'll do this so get tested before that special night with that someone. Before safe than sexy time.