@Simone_De_Beauvoir, firstly great you are running such a class.
I think it would be good for them to have an opportunity to talk about relationships and the place sex plays in relationships. Rather than the focus being purely on the mechanics and safe sex etc. messages.
How to maintain healthy self-esteem, to say no and that it is okay to say no and they shouldn’t feel or impose pressure to change someone’s mind if they choose to say no.
Information about what constitutes sexual harassment and rape and how to avoid such situations.
Information about safe sex and the increase in sexually transmitted diseases and that yes, they too can pick up an STD if they don’t take responsibility for their own sexual health.
Where to go for help if something does go wrong and that things do go wrong.
I am sure you will do this, but I would facilitate and encourage them to carry out and share their own research and ideas rather than lecturing. Lots of them talking and you listening and guiding. I really do doubt you would take an authoritarian approach but it is worth mentioning.
Don’t underestimate them (again, I am sure you will not do this).