I guess the chemistry between the couple and the amount of foreplay definitely will play a part in the build up. Previously I was dating this girl who said she couldn't squirt too. Took a couple of sessions to finally make her relax through alot of foreplaying. Went down on her which she claims no ever done it to her. Subsequently applying the fingers to the right spot and all of sudden she was just jerking and a huge splash of water just gushed out down south! One hello of an experience