Koj yuav saib tau li cas thiab tsis xav koom nrog? Txawm hais tias tus pojniam plaub hau daj yog me ntsis shabby, tab sis tsuas yog zaum thiab saib lub impotent ntawm lub txaj kuv yuav tsis tau. Tau kawg, muaj ntau ntawm silicone nyob rau hauv tus me nyuam qaib, tab sis nws yog tag nrho ntawm qab.
Cov tub ntxhais kawm xyoo tsis yog tsuas yog lub sijhawm ntawm kev nkag siab ntawm kev paub txog science, tab sis kuj yog lub sijhawm ntawm kev sib deev. Yog li cov tub ntxhais kawm no es tsis txhob dhuav cov lus qhuab qhia tau paub txog kev sib deev ntawm qhov ncauj thiab qhov quav hauv tsev.