My first wife did...
We were intermittent swingers ... invited this young guy (he was 19, we were upper 20's) to have an MFM threesome with us.
I'd had a vasectomy - so she wasn't on the pill.
We didn't use nothing ... but the 'Today Sponge' that we did use wasn't effective (enough)... as she got knocked up during our play time. She hated condoms - and part of the thrill for me was the sloppy seconds.
It didn't end well.
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