Earlier this year, it seemed like I'd get infection after infection, after just making a 200 mile move 'north' ... Oregonian winters are wet, but I don't know that that justifies it.
The Y/i thing and humidity/time in the saddle DEFINATELY correlate. Some things I made sure to change/do:
1. take off the damp/sweaty chamois/shorts ASAP after getting home, rinse off in the shower and dry well.
2. Make SURE when you treat them, you get them GONE. My first 3 were actually (according to the gyno) were recurrances of the 1st, which hadn't been 'properly' treated. (don't putz around and waste time with yogurt and home remedies most of the time)
3. do NOT use antibacterial soap 'down there'. (had no idea GF's soap was such, and.. um... yeah.)
4. wear boxers or similarly airy, breatheable underwear as much as is practical, esp. after a ride.
5. This one's weird, but when you start 'feeling one coming on' or are in doubt, an individual little clove of garlic, with the papery stuff removed, put 'up there' is the most effective 'home remedy' I've tried, and will head the infection off before it turns into a full-blown pain in the ***.
Hope this helps...
I wouldn't wish those things on anyone.