Avoid direct sunlight and steep hills, and back off the pace as soon as you begin to feel that faint prickly sensation that says you're about to sweat.

As I got more fit, I found that I could go faster in warmer weather while having light perspiration. The body can adapt - I suspect that metabolic efficiency improves.

Body odors are more from clothes. A clean set of clothes skin out, after wiping excess sweat off, will avoid the odors for the duration of a workday. Also wash the cycling clothes before wearing them again if they were damp.