Apologies if this is not an appropriate question for this space, but I'm wondering about something. The last few times I went for an STD screen or check up, the doctor asked about my sexual history and also about my partner's - they asked if he'd had a high number of partners before me (the doc thought I might have chlamydia but nope, I had my normal thick discharge!) which got me thinking, what is a high number anyway? 5? 10? 20? 50? From a medical perspective, what is considered a lot of partners?