i have an electric bikini trimmer that comes with different attachments - epilate, trim and shave-right-off. the epilation one is agony, the trimmer one is handy if you just wanna go shorter, and the shave-right-off one gets rid of all your hair but when it grows back it's very itchy, and often leaves you with red spots where the hair folicles become blocked. I think using a shaver "Down there" always leaves the skin quite irritated, no matter how sensitive your skin is. Thorough exfoliation before shaving can help to minimise the irritation, and gentle exfoliation and moisturisation of the area helps afterwards.