These models are from http://jimjacksonanatomymodels.com/ It can be a little difficult to find the kind of anatomical model that you want for a sexual education class.  I’ve used these models and I think they are very instructive.  They are realistic so it may not be appropriate for all audiences but a lot of folks need things this concrete.  If you’re teaching condom use, make sure to use vinyl condoms (latex condoms can hurt the models).  The cost of the models ranges from $180 – $660 depending on what you’re getting.  It’s an investment, but a great teaching tool. WebMD has nice anatomical line drawings that are okay to print for free. http://www.medscape.com/features/ald/repro Once you get into color photos, they usually ask you to pay.  You can probably find some on the internet that don’t have water marks (like on webmd or mayo clinic ) but they are usually copyrighted. This site will give you a lot of options available for purchase http://www.fotosearch.com/photos-images/reproductive-system.html  This site has more medically technical options (they also have online interactive models, but those are pretty technical too).  http://catalog.nucleusinc.com/generateexhibit.php?ID=9591