 " Double bagging " , using two condoms at once , is often believed to cause a higher rate of failure due to the friction of rubber on rubber . This claim is not supported by research . The limited studies that have been done on the subject support that double bagging is likely not harmful and possibly beneficial . 
 " Double bagging " , using two condoms at once , is often believed to cause a higher rate of failure due to the friction of rubber on rubber . This claim is not supported by research . The limited studies <a href='null_relcl' title='1'><mark>that</mark></a>have been done on the subject support that double bagging <a href='negative_concord' title='2'><mark>is</mark></a> likely <a href='negative_concord' title='3'><mark>not</mark></a>harmful and possibly beneficial . 
 Double bagging  , using two condoms at once , is often believed to cause a higher rate of failure due to the friction of rubber on rubber . dis claim ain't supported by research . da limited studies have been done on tdasubject support that double bagging ain't likely harmful and possibly beneficial .