Marketing condoms is not an easy job. The target is young and therefore it's difficult to get its attention, furthermore the product is "delicate", because of ethics and religion. Trojan did great last year creating the award winning viral campaign "Sex Olympics", now Durex is trying to do something as innovative buying advertising spaces in podcasts.
Advertising Age explains the decision allows Durex to directly connect with its target, which is represented by people who spend more time online than watching Tv. Furthermore the solution sounds pretty inexpensive and, most of all, it enables Durex to avoid FCC strict regulations about what you can and cannot show/say when promoting condoms.