Someone not willing to use "protection" and/or someone who is honest enough to tell me that he/she has herpes or HIV, etc. I mean, I'd be happy that the person was honest about it, but I'd prefer to not take any chances if this was just a matter of lust. Also would be totally turned off to someone with poor hygiene or who is conceited, bigotted, a drug user (especially one involving needles), or super conservative sexually or politically. I know...I'm picky.

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Communication is the key.