My wife and I are both straight and work in the medical field, so when a male says he is BI ,due to the fear of disease we pass. Our profession allows both of us to have free and frequent lab tests for STD's, HPV's , AIDA's etc. We are doth disease free and plan on staying that way , we are very selective and play with just a few couples we trust and know.
We also tend to avoid those with body tattoos and piercings for much the same reason.