The role of the partner depends on the kind of position they want to use. Let's take for example the spooning position. In this position, the man is the one who takes the initiative to make the thrusting motion while lying on his side behind the woman's back. The woman's role is merely communicate to the man if it's getting painful or pleasurable. On the other hand, in the woman on top position, the woman is the one taking charge. She positions herself on top of the man, while dictating the rhythm of the act with the upward and downward motion of her body. Just make sure to pause for a while when it gets uncomfortable.
Many say you have the best sex of your life during your pregnancy. One of the top Obstetricians (and my personal favorite), Dr. Irina, shows when it's safest and how to have the most exhilarating sex during pregnancy in her latest book
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