That might be part of it, but at least as big a problem is the male side of the equation. Guys talk too. And friends, brothers, fathers, and uncles are often telling males to avoid marriage like the plague.
To have a marriage, both parties have to be willing to say “I do” at least once. And now we have a culture where a near majority of kids are born to an unmarried mother and are unlikely to have had any experience with marriage, good or bad.
When my sons were teens, my husband was not paying much attention to their development needs. When they were each about 13, I had two long conversations with each. The first were about all the biological, medical aspects related to sex and reproduction. The second was about the emotional pressures and needs of males and females I also told them it was not wise to engage in sex until mature and preferably married, but that we would be very angry if they got someone pregnant. I also told them where we kept our condoms. My one son was a real social operator and I could hear him headed for our bureau upstairs some nights when he had a date. They both got married in their late 20s, and have children and are still married to the same woman in their mid/late 40s.