One size fits most
Despite what you may hear, condoms do not suffocate a penis. Most latex condoms are about seven inches long and two inches in girth before they are stretched. They are designed to stretch over a horse's head, so if your man tries to protest using one by saying it's too small, blow one up for a party favor and see the truth. If that doesn't work and your man really does need more room, look for those varieties specifically designed for him, such as Maxx. Most of all, shop around and try different brands and types.
Be sure to use latex or polyurethane varieties instead of all-natural types, such as lambskins, which have pores that permit the transmission of disease. Always use latex with water-based lubricants applied on the outside for easier movement plus a little dab on the inside tip for increasing his pleasure. The jury is still out on whether you should use a spermicidal lubed condom, as some research indicates that using one may increase the risk of the spread of disease, especially HIV. Obviously, using a spermicide has a positive effect on pregnancy prevention. You should know that condoms alone are 86 percent effective as a contraceptive.