Is it true that after you loose your virginity your breast get bigger and your hips get wider?

Coincidence. Women often first become sexually active when they are young adults. Going through puberty, which often happens around the same time, causes changes in their bodies, including growth of the breasts and change in distribution of around the body. Having sex doesn't cause these changes.
Not true. These are the symptoms of pregnancy, not of loss of virginity. Only changes a woman experiences is the hymen is stretched or tears, if it hasn't been torn before.