I have no knowledge about the USN, but my ...... was in the USAF, still is for that matter, and when he was in Germany he was allowed to have his wife and 2 sons living on base with him. I had heard years prior that in WW2, what is now called 'swinging' got its start in the USAF among the members of flight crews due to dangerous missions and they wanted to have as much fun as they could in case they didn't return. My ......'s Asian wife has a high libido and she met and began to associate with other wives on the base and before long they got her interested in swinging. My ...... told me that at first he wasn't so sure about it but after only 2-3 parties, he found that he absolutely loved watching other guys banging his wife, and of course she loved it as much as or probably even more than my ....... In a short time she was sucking and fucking dozens of guys, some younger but some older as well, and a fairly high% were black guys. So I guess it is going on still, at least in the USAF.