The manual stimulation of each other's genitals where the session eventually leads to sexual intercourse.

Alongside the manual stimulation, electric stimulation (2 to 5 Hz) was also given to four of the ten needles.

The hands are then free to be in front or back between the legs for manual stimulation of either partner.

The penetrating partner usually controls the rhythm and force of each thrust and they may also give massage or manual stimulation.

However, this position may offer only minimal stimulation of the clitoris, so some women may require manual stimulation.

This will be followed by manual clitoral stimulation.