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Whether it is the first time or the thousandth time, you can get pregnant from having sex.
Hormones During sex, your brain releases lots of chemicals, including endorphins and the hormones dopamine and oxytocin.
Description: Nipples During a state of sexual arousal, blood circulation around the nipples increases, and your nipples might become more sensitive than usual. This is also a temporary change that accompanies arousal and will go away.