dh and I went one one of these as a condition of marrying in a Catholic monastery church (that was eleven years ago, before I became strident confident enough to defy his bloody mother and my family and say "I'm an atheist")
it was three days, at a retreat centre in the Wye Valley
you were encouraged not to talk to anyone except your partner unles absolutely necessary, and no talking at mealtimes
little white beds with wooden crucifixes nailed above them
there were "seminars" where we all sat on plastic chairs and listened to Catholic couples whose relationships were deemed "successful" to the point of exemplary
there was a couple in their early thirties who kept crying and squeezing each other's hands as the recounted painfully how they had reached various "compromises" over sex, the children, schools etc - you could see that the strain was killing them and what they really needed was a good old fight
there was a couple in their sixties - husband wearing neatly pressed work shirt and slacks, wife very much a churchy flower woman type, big billowy florals, fake pearls etc - the memory of their "testimonial" that sticks in my mind is her describing how "sometimes, when Gary is washing up, I might cume up and just rub myself against his leg, to let him know that I am feeling....intimate"
they were at great pains to impart to us the generosity of God in allowing pleasure to come with so functional and sober an act - "it's like a nice little present really"
Then there was the priest, who started off lecturing sternly about abstinence and the need for the woman in particular to practise self-discipline - it's woman's innate sexual savagery that leads to AIDS and unwanted babies btw, not lack of birth control
he droned on for about an hour and ended up rubbing his hands and making a misty-eyed speech about how overwhelmed he constantly was by the beauty of women, and how clever God was for managing to somehow re-route all that sizzling sexual energy into a sort of generalised philanthropic love for each and every one of his parishioners
it was fucking HIDEOUS.