If you MUST ride your bicycle to work wearing lycra instead of ordinary clothes, then please change as soon as you arrive.
Trust me on this one - no woman in her right mind wants to have to look at a man strutting proudly about the office for hours with his wedding tackle on display. The only wedding tackle a woman finds even remotely attractive is that belonging to the man she shares a bed with.
(Curiously, this lycra obsession seems to be pretty much exclusive to people living on the south side of the Yarra River. I don't see many people wearing lycra gear at all riding their way to work from Brunswick...)