My wife's vagina lately tastes sweet. during intercourse a thick white pasty fluid comes out of her? normal? could this be some sort of std? should i get tested? do i need to?

Sounds : Sounds like she may have a yeast infection but hard to know without an exam. No worry for you but i wonder how she feels. She should get checked out especially if she is having vaginal soreness or itching or other symptoms. I assume she notices the discharge too.

Thoughts: Sweet=increased sugar content in body secretions=risk of adult onset diabetes. Yeast love sugar and tend to grow faster in environments where extra sugar is found. A first thought is that she could have undiagnosed adult onset diabetes and a mild yeast overgrowth. This would not be a STD but deserves a visit to sort it out.