Latex condoms, which are the least expensive, most accessible type of
condoms at the moment, are designed to prevent the transmission of HIV,
or any virus for that matter. HIV is larger than the pores in condoms.
For those allergic to latex, male and female condoms made from
polyurethane also provide protection. Polyisoprene condoms, a recent
addition to the market, provide latex free protection and are being
marketed for a natural feel.