if you do shave 'down there', try to find a product called 'skin tends'. it's specifically designed to assist with irritation caused by shaving in those areas. you can usually find it at a beauty suppy store. it's the irritation after shaving that is causing more ingrown hairs. 'skin tends' will lessen the irriatation thereby not causing the hair follicles to become inflamed. also on non ride days, try dusting lightly with gold bond powder.
hope it helps...
soph