Some people fantasize about their partner having sex with another person. Such sexual fantasies may involve threesomes or larger numbers of people involved in group sex or orgies. Other times people fantasize about their partner is cheating on them.
We don’t fully understand why some women experience multiple orgasms and others do not. In part, it may have to do with expectations about sex and orgasm. After all, even one orgasm is difficult for some women to experience, so some women may be happy with one orgasm and may not even try to have a second orgasm after their first.