Never...nuh-uh, noway.
The way I see it is that no matter how safe you are, swinging or sex with others is always risky. Some veneral deseases are deadly to a developing fetus, as well as cause many birth defects. I am not sure why any woman would risk that?
I know that pregnancy was the horniest time in my life, and MR. Indy knew just what to do to help me through it. It was great to experience it with him.