1 Corinthians 7:4 reads as follows:
The wife does not have authority over her own body but yields it to her husband. In the same way, the husband does not have authority over his own body but yields it to his wife.
In the Biblical books verifiably known to have been written by the apostle Paul, such as 1 Corinthians, equality in Christ is an important concept. Paul here alludes to the idea that when two people get married they become one flesh. As Paul puts it, they each give their body to the other person. They are in a physically equal relationship.
In the context of the Roman society in which Paul lived, this was quite a radical idea. Roman society was organized around the idea of the paterfamilias. This "father of the family" was the central male figure in an extended family unit that included wives, children, stepchildren, assorted relatives, and slaves. In Roman thought and law, the paterfamilias had total ownership of all the bodies in his family.
Paul's concept of marriage turns this inequality on its head, at least as far as spouses are concerned, in saying that a husband and a wife are equals. We need not wonder why women were attracted to this faith.