[rikibro]

You lost me at "Blood donation". It's common sence that this is used by new couples to check if they have STDs, without the unconfort of going to a clinic.

Relating to the 2nd study, 100$ or 1$ is the same (not significant) for someone with high income so they just found a correlation between "rich" people and higher number of sexual partners.

Do you concur?

[maxerickson]

Blood donation is a terrible way to screen for STDs.

I get that people might ask about it because people who donate blood do have their blood tested for some STDs, but just asking isn't going to help a whole lot if you are talking to a liar.