Sentence:  In one extreme case , cited by a Pittsburgh psychologist , an office worker 's wife refused to have <WSD>sexual</WSD> relations with her husband unless he bought her the luxuries she demanded . 
Meaning of the word marked with <WSD> tags:  the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur