 Collection condoms are made from <unk> or polyurethane , as latex is somewhat harmful to sperm . Many men prefer collection condoms to masturbation , and some religions prohibit masturbation entirely . Also , compared with samples obtained from masturbation , semen samples from collection condoms have higher total sperm counts , sperm <unk> , and percentage of sperm with normal morphology . For this reason , they are believed to give more accurate results when used for semen analysis , and to improve the chances of pregnancy when used in procedures such as <unk> or <unk> insemination . <unk> of religions that prohibit contraception , such as Catholicism , may use collection condoms with holes <unk> in them . 
