 Condoms made from sheep intestines , labeled " lambskin " , are also available . Although they are generally effective as a contraceptive by blocking sperm , it is presumed that they are likely less effective than latex in preventing the transmission of agents that cause STDs , because of pores in the material . This is based on the idea that intestines , by their nature , are porous , permeable membranes , and while sperm are too large to pass through the pores , viruses — such as HIV , herpes , and genital warts — are small enough to pass through . However , there are to date no clinical data confirming or denying this theory . Some believe that lambskin condoms provide a more " natural " sensation , and they lack the allergens that are inherent to latex , but because of their lesser protection against infection , other hypoallergenic materials such as polyurethane are recommended for latex @-@ allergic users and / or partners . Lambskin condoms are also significantly more expensive than other types and as slaughter by @-@ products they are also not vegetarian . 
 Condoms made from sheep intestines , labeled " lambskin " , <a href='drop_aux' title='1'><mark>are</mark></a>also available . Although they <a href='drop_aux' title='2'><mark>are</mark></a>generally effective as a contraceptive by blocking sperm , it is presumed that they are likely less effective than latex in preventing the transmission of agents <a href='null_relcl' title='3'><mark>that</mark></a>cause STDs , because of pores in the material . This is based on the idea that intestines , by their nature , <a href='drop_aux' title='4'><mark>are</mark></a>porous , permeable membranes , and while sperm <a href='drop_aux' title='5'><mark>are</mark></a>too large to pass through the pores , viruses — such as HIV , herpes , and genital warts — are small enough to pass through . However , <a href='dey_it' title='6'><mark>there</mark></a> are to date no clinical data confirming or denying this theory . Some believe that lambskin condoms provide a more " natural " sensation , and they lack the allergens <a href='null_relcl' title='7'><mark>that</mark></a><a href='drop_aux' title='8'><mark>are</mark></a>inherent to latex , but because of their lesser protection against infection , other hypoallergenic materials such as polyurethane are recommended for latex @-@ allergic users and / or partners . Lambskin condoms <a href='drop_aux' title='9'><mark>are</mark></a>also significantly more expensive than other types and as slaughter by @-@ products they <a href='negative_concord' title='10'><mark>are</mark></a> also <a href='negative_concord' title='11'><mark>not</mark></a>vegetarian . 
Condoms made from sheep intestines , labeled " lambskin " , also available . Although they generally effective as a contraceptive by blocking sperm , it is presumed that they are likely less effective than latex in preventing the transmission of agents cus STDs , because of pores in the material . This is based on the idea that intestines , by their nature , porous , permeable membranes , and while sperm too large to pass through da pores , viruses — such as HIV , herpes , and genital warts — are small enough to pass through . However , it is to date no clinical data confirming or denying this theory . Some believe that lambskin condoms provide a more " natural " sensation , and they lack tdaallergens inherent to latex , but cuz of their lesser protection against infection , other hypoallergenic materials such as polyurethane r recommended for latex @-@ allergic users and / or partners . Lambskin condoms also significantly more expensive than other types and as slaughter by @-@ products they ain't also vegetarian .