does the size of vagina increases as we are more and more on sex?and does our hips become more rounded and expandands if we sex very often?

Hi Anonymous,

Just as the vagina has the capacity to expand, allowing for the passage of a baby during childbirth, the vagina also has the ability to elongate during intercourse to accommodate a penis. For some women, the depth from the vaginal opening to the tip of the cervix is 3 to 4 inches when they are not sexually aroused. Other women may have a vaginal depth of five to seven inches. Regardless, during arousal, blood flows to the genital area, and sexual excitement causes the upper two-thirds of the vagina to lengthen by forcing the cervix and uterus to ascend. The vagina also lubricates to help ease penetration. 

So, even though you think your vagina has elongated, the fact is that your vagina has accommodated to the size of the mans penis based on your arousal. Your hips may be rounder but this may or many not have anything to do with sex, it could just be changes in your body as you get older.

I hope this answers your questions,

Rosa