Mating Center by Frank Belknap Long

Teleman had no way of knowing that the scanners had picked up his trail again as he stood listening to the whispered conversation of the dwelling's two occupants.

Despite the absolute darkness and Teleman's stillness the woman became suddenly aware that she was not alone with the man at her side. Her startled gasp was unmistakable and the stirring and shifting of position which followed immediately left no possible room for doubt. All of the sounds were sounds of agitation and swiftly mounting alarm, a whispered reply from the man which Teleman could not catch, another gasp from the woman, a rustling of the bedclothes, a creaking of the bed as one of the two lovers, probably the man, either sat bolt upright or propelled himself toward the edge of the bed with a violent lurch.