haha why do ppl wanna know what sort of prevention others are using!
reminds me of the time during Olevel biology (back in the raging hormonal times)! we were studying human reproduction and condoms in particular, and this one gutsy raises his hand and goes 'sir what sort of a condom do you use', the teacher goes 'the same one your dad uses'! haha!
You can always tell those pesky people its none of their business, or politely tell them its something really personal and you dont feel comfortable discussing it.
haha that was so funny