the physical condition of being stretched or strained;
"it places great tension on the leg muscles"
"he could feel the tenseness of her body"
lack of movement or room for movement
May try to build with a leg on his shoulder, buttocks' extension causes feminine vagina muscle tautness, therefore the vagina stricts, has overcome the vagina too loose question. 可以试着用一腿搭在他的肩上，臀部的伸展使女性的阴道肌肉拉紧，因此阴道变窄，克服了阴道太松的问题。