In reply to Taer:
I sympathise.
First thing (apologies for stating the obvious), but sort your clothing first:
- No cotton or thick seams. This includes underwear if all possible.
- Wear the lightest fabric possible on your legs
- Get a belt, or otherwise ensure that your trousers/shorts are properly hitched up and moving freely, and not hanging low around your hips/crotch
- A pear of very thin light lycra shorts can help
- Generally make sure you are not getting hotter or more sweaty than necessary
I used to have the same problem a lot. Switching to old school running shorts with an internal brief for my summer hiking pretty much got rid of the problem. A pair of running tights is a good backup when the weather is cooler, but actually the smooth fabric and internal brief make running shorts a good undercracker choice even under light hiking trousers.
There are various lubes out there. I found Chamois Buttr really effective - tenacious! You can get it in most cycle shops or online.
Good luck.
Mark