Hi, thanks for the query. Before beginning my answer; you need to understand that sexual relationship is a 2 person based issue & not a single person s concern. So, if your wife has suddenly started refusing for sexual intercourse means she no longer finds sexual activity pleasurable or sex was NEVER pleasurable to her & she complied to your demands as long as she could tolerate & after having a son; she has put her foot down saying enough is enough!! Hence, rather than going for easy pep solutions like some tablet, cigarette smoking etc. first strike a rapport with your wife & encourage her for a free & frank discussion about what she feels about sex in general & whether you as husband/bed partner have been able to satisfy her. Then move on to why she has started refusing for sex; whether sexual intercourse is painful; whether you are no longer attractive or not able to satisfy her etc. & encourage her to give a free, frank answer. Depending upon problems faced by you as couple; you should both visit a Psychiatrist or get in touch with MASTERS & JOHNSON S therapy for human sexual response & intercourse. This will take care of lots of myths held by both of you regarding sex; will encourage both of you to rediscover your lost flair & help you two enjoy sex once again!! Hope this helps, good luck