LOL!!! Great question.
First let me say I am not a medical professional, nor do I play one when my wife and I get frisky. The advice I am about to give is that of a technical professional and in no way should be used to make medical decisions.
Ok, now that that is out of the way...
Simply standing in the sunlight you are exposed to radiation thousands of times as powerful than if you were to put the antenna up to your head. I feel he should be just fine.