According to research, women are more generous with gifts and drinks in the second half of their menstrual cycle:

The generosity may come as a pleasant surprise, but their timing can be quite predictable.

According to one study, women are more likely to offer gifts and drinks to friends and partners during the second half of their monthly cycle.

Researchers examined female hormones and found that increases in progesterone and lower estradiol corresponded to more generous behaviors.

This combination of hormones occurs in the luteal phase, two weeks after ovulation, when a woman’s body prepares for a possible pregnancy.

Experts from the Heinrich Heine University in Düsseldorf, Germany, have suggested that at this stage women become more sociable to “make friends” to strengthen the social network that can take care of them during pregnancy.

The increase in progesterone is said to encourage “proactive and unwanted prosocial behavior”, while mutual “help, support and protection” is said to increase chances of survival. But the generosity did not extend to outsiders.

Researchers examined female hormones and found that increases in progesterone and lower estradiol corresponded to more generous behaviors. The psychologists studied 129 women between the ages of 18 and 36 with regular menstrual cycles.

The psychologists studied 129 women between the ages of 18 and 36 who did not use hormonal contraceptives and had regular menstrual cycles.

They are given a task where they must choose whether to receive a high selfish reward for helping or a lower reward for themselves with rewards for other people.

Meanwhile, saliva samples were taken from each of the women and tested for the different amounts of hormones they contained.

The article, published in the journal Psychoneuroendocrinology, states, “With high progesterone levels and low estradiol levels, participants tended to be more generous with others who were socially united.”