I spent 13 years of my life doing time at Catholic schools. I received an excellent college prep education but the religious part didn't stick. However, the schools did present an interesting take on sex education.
In grade school and middle school, we learned about the finer points of anatomy from an oddly named series, New Creation. We had sadistic teachers who delighted in making students read aloud from the books.
I do remember a very odd chapter, possibly titled "Petting." It was absolutely bizarre. The chapter indicated that it was wrong to "pet" outside of marriage. I was a bit freaked out by this "petting" term and had no idea what it was exactly. Even then, as naive as I was, I felt that all was not right with the book. Even though we were using the books in the late 80s/early 90s, I bet that the content's original copyright was in the 50s or perhaps the 70s; it's the only logical reasoning for the bizarre statements.
In high school, the fun continued, or perhaps it didn't. The only health-related information we received was in the Christian Living class during our senior year (too little, too late, perchance, judging by the pregnant 16 and 17 year olds?) in which we had to watch a video of a woman giving birth and a Bill Cosby comedy skit. I wasn't sure whether to laugh or throw up. I only did the former.
We did have one assignment where we had to carry around an egg "baby" all week, supposedly to help us appreciate the responsibilities of parenthood. Public schools, who actually have money, usually use a high tech mechanical doll thing that can even measure the quality of care. We had Grade A eggs. We had to draw the name of our "spouse" and the co-parent of the egg baby. I was totally unlucky, however, and drew the name of a kid that I swear had to have been a total crackhead. I had a fit and demanded an instant divorce and that Child Protective Services needed to be called in. To pacify me, the teacher said that I could be a single mom and that there would be no visitation privileges. Thank goodness.