Excuse me for having not read this whole thread, but isn't the only actual debate here whether or not it is sexist to depict women in a suggestive/lightly dressed way on clothing, and if it is then ok to wear a shirt such as that when you are in the public eye as a professional scientist?
So, for point one, I can see why some women might feel offended by such a shirt. They might feel that it objectifies women, or reduces them to a decoration/pattern on a shirt.
Personally I would not see that as offensive, because my stance on the concept of objectification would not be compatible with being offended by this shirt. Furthermore, if putting suggestively dressed women on a shirt is offensive, than it's safe to assume that putting suggestively dressed people on anything is offensive period. And that would be a very slippery slope to climb, if you ask me.
Point two, I personally believe it should be acceptable to wear whatever fashion you want, as long as it isn't literally indecent (i.e. it doesn't have images that wouldn't be suitable for children/anyone to see). Just because he is a scientist doesn't mean he isn't also a human being with interests, hobbies, and personal tastes. He clearly is into eye-catching/colorful/"loud" displays of fashion, from his tattoos to the shirt, so why should he have to leave a part of himself out of his work persona?
That said, I don't think society is ready to accept that scientists aren't all nerds who wear pocket protectors all day, and his job is clearly somewhat prestigious/desirable, so perhaps he should have weighed those things against his own desire for personal expression through fashion.
Overall though I think we can all agree this is pretty much a non-story when put side by side with what was actually accomplished.