I have friends that refuse to bike to work (even short distances) because they don't want to get sweaty.

It's a valid argument if you don't already bike to work, or have a tough commute, or sweat a lot. But if you bike frequently, you sweat less as you become more fit. You can also control your pace. And if your office has a place for you to change (or even shower), then it becomes even more appealing.

Although I disagree with scooting over biking for short distances, I'd imagine a lot of people have this fear of arriving to their office with any sweat.