I remember teenage trips to the library to research sexual techniques, venereal diseases, and birth control. I was, er, unusual, I think.
I've always taken great interest in my GFs' cycles and I'm not aware of any unwanted pregnancies.
My wife tried BCPs before we were ready to have children and within a few months we agreed that our relationship wouldn't survive the psychological effects. Gives me the chills to think about it even after 31 years.
Rhythm actually worked well for us over 20+ years so I never felt pressured to consider a vasectomy. We tried for pregnancy 3 times and have 2 children (yes, from the attempts). There were certainly times when late cycles gave us a few days of anxiety.