hmmm not sure if it was the same type of thing but when I was pregnant with Niki I had this strange pulsating feeling like the walls of my vagina were going in and out, in a pulsating kind of way - sorry its difficult to explain the sensation. Definitely not in a sexually arousing way but kind of like when you climax??

Nae x
oh that pulsing thing yeah i have had that and your description is right espeially the climaxing bit, but it is not this sensation.

this sensations it last for a few seconds like really fast kicks or something its strange.