My sons are lovely lads, happily married or engaged, in good jobs, university graduates etc, but we DID have a similar talk. I told them about safe sex, about what stops the pill working and why they should always use a condom, and about being responsible. Their Dad told them to respect women and never treat them like objects. He also said that if they did get a girl pregnant they would take their share of responsibility for the child.
This was not because we thought for an instant that they would do anything bad to a girl - they were brought up to be kind and responsible: it was just that we wanted them to face up to the world as it is, not as we'd like it to be.
Anyway, they never got into any of that sort of trouble, but that's beside the point. The Talk us necessary.