Hi, thanks for your question.

A woman may be in pain during sex. This can happen for a number of reasons, such as not enough lubrication, the penis at the wrong angle, or the penis being too big for the vagina.

However, the most likely reason that a woman goes "oh oh oh" during sex is that she is finding it pleasurable or likes the feeling. Woman may be more inclined to make this noise when they are reaching orgasm. This is a time when the muscles of the vagina start to contract and the clitoris becomes very sensitive and excitable. For more information on female anatomy and orgasm, see the links below.

Women might be influenced to make noises during sex because that's sometimes what movies show women doing, which is shown in the movie to be "normal". Sex scenes in movies are not always realistic though, so they can put unrealistic expectations on people to do certain things during sex.

The best thing to do if you're having sex and your partner is making noises is to ask them "Are you okay?", "Are you comfortable?" or "Does this feel okay?" By asking these questions you will know if she is in pain (and if she is, stop) or if she is simply enjoying it

Remember that using condoms and lubricant is important during sex. Women may be more likely to orgasm when condoms are used because they can relax and not worry so much about getting pregnant or an STI! Hope this helps.