I think you meant this, but I just want to clarify that sex
is a direct part of the Sacrament of Matrimony. No sex, no Sacrament. It’s not just a renewal, and it’s not the Sacrament in and of itself, but it is significant enough that if a person isn’t able to sexually function, espescially a male, they are not considered to be eligable for the Sacrament of Matrimony. It’s as much a part of Matrimony as water is for Baptism.
As for the topic of the thread, I don’t think that talking about God in relation to sex shows repression at
all. You have no idea what goes on in Catholic bedrooms, but I can tell by what you’re saying that you think it’s some uneasy, awkward thing, rather than sweaty, passionate romance that leaves people feeling like they’ve run a hundred miles to jump into a pool of chocolate pudding and whipped cream. Most faithful, practicing Catholic couples are MUCH more likely than the average non-Catholics to fall into the latter category rather than the former.
Besides, everyone seems to yell “Oh God!” during sex, even seculars. Ever wonder if maybe Catholics are on to something?