 Some latex condoms are lubricated at the manufacturer with a small amount of a nonoxynol @-@ 9 , a <unk> chemical . According to Consumer Reports , condoms lubricated with spermicide have no additional benefit in preventing pregnancy , have a shorter shelf life , and may cause urinary @-@ tract infections in women . In contrast , application of separately packaged spermicide is believed to increase the contraceptive <unk> of condoms . 
