How about recreational skydiving.
Your comment has also classified homosexuality as a behavior. Gays realized that once their learned behavior has been classified as such, they have lost the argument. This is why they claim they were born queer.
Regardless of your unintended mistake, equating the voluntary spreading of disease with skydiving is not exactly a superb example of sound thinking, yet it is not a total surprise that a secularist would make such an absurd claim.