There was once a married couple, Jan Davis and Mark Lee who both flew on STS-47, a 7 day mission to Spacelab in 1992. Not saying sex did happen, but this would

There was once a married couple, Jan Davis and Mark Lee who both flew on STS-47, a 7 day mission to Spacelab in 1992. Not saying sex did happen, but this would be the incident with the highest probability.