Abstract: Female Sex Workers (FSWs) are key population due to their vulnerability arising from their behavior, society stigma, and discriminative laws that hinder them from acquiring preventive and curative health services. Prostitution is a big industry with 40 to 42 million persons globally 75% aged 13-25years and 80% of them being female sex workers. According to Odek, Githuka and Avery mapping in 2014, Kenya hosts 10670 hot spots of about 138420 female sex workers despite the government ban on sex work in 2017 under section 153 and 154 of the penal code. Nairobi City County accounts to 25% of the female sex workers in Kenya. Kenya falls in Sub Saharan country where highest risks of deaths result from HIV, unsafe abortions and unskilled deliveries. Female sex workers who form 5% of the women of reproductive age are at risk to sexual reproductive health complications since they are unable to negotiate for safe sex and seek prompt health services or legal interventions. 31% of maternal deaths in Nairobi are attributed to unsafe abortions while HIV prevalence among FSWs is 29.3% more than 4 times the prevalence in the general population in Nairobi.