Just had to share my two cents here. While offering oral sex to a woman who indulges in intercourse with multiple partners is unsafe, have any of the forum members heard of diseases like:
a. HPV (Genital warts) - Just skin contact is enough.
b. Herpes Simplex - Same case as above.
There are quite a few more like these which can easily be Googled. While I am not as experienced as you guys, I personally feel that being very picky when it comes to girls like these is the key. Engage in some soft core stuff before moving on to full on fun.. one might end up spending some extra money for a 'second' meet but won't loose their minds in case of an unfortunate event.
PS - I'm hoping the above is taken in a positive way and people don't end up bashing me, haha.