Edited sentence: All of the positions described for heterosexual couples work equally well for lesbian couples in which one of the partners is wearing a strap-on dildo.Most of the heterosexual positions can be performed by males upon males, although some with more difficulty due to a differing angle of entry.Since most sexual partners throughout the world are heterosexual, most of the positions listed below are described in terms of one male participant and one female participant.When the gender of a participant is not specified, that participant may be male or female