Just received small pox vaccine, was told no sex? is this true ? for masturbation/unprotected sex?

Depends: If you are one of the rare people to get this vaccine in the modern era there are some basics you need to understand. The vaccine is a living (weak) virus similar to smallpox. Recipients must be healthy. During the early reaction period you will circulate that live virus & could pass it through sexual secretions to someone who would be at risk from the vaccine. Self sex would not be a problem.