For comfortable and sensuous sex, the man and woman should lay side by side. They can either face each other or face away from each other. The woman can place one leg over her partner’s body until late in the pregancy, when the bump gets in the way.
Spooning sex is great during pregnancy: the woman lays on her side, slightly curled up as shown in teh pictures below. Her partner positions himself behind her and then enters her from behind. Unless he’s very well-endowed, penetration is shallow (unless she lifts one leg high in the air) which means this can be a very comfortable sex position during the later stages of pregnancy.