I think we should treat these types of allegations with the seriousness they deserve. The admin or mod can recuse themselves temporarily and let the process occur. The site shouldn't fall apart from one person being temporarily or permanently removed from their position. Therefore we should not hesitate to do the right thing, treat them seriously, investigate, and reach a verdict.

That said, I think all admins and mods should learn more about op-sec (myself included) to prevent this from happening. Additionally, I've always made the point to separate my community persona from my dating persona. Even at work, I never hit on the women there, to the point they thought I was gay. I rather come off as completely uninterested than a sex pest.