How Do You Handle Randy Jokes From The Opposite Sex - Nairaland

I have this thing disturbing me and I just want your honest opinion. I work in a place currently that my female colleagues are something else. 
What I mean is that they discuss and make sexual jokes and say saucy and obscene things when they come around me,both married and unmarried.

One of them was bold enough to ask me if I had ever had sex or have a girlfriend, she was so keen on that. The married ones also come around me and try to get me like give them money,asking me if I have a girlfriend and has 'knacked' before, they say all manner of sexual stuff around me waiting for my reply which I don't reply in that same vein,I either scold them or leave their midst,but to me that isn't the first time I am having women talk so boldly about sex around me.

I remember one showing me even sex positions on her phone and asking which one do I like and have I done, and this lady can hardly let me be,though engaged to another man who is outside the country, this was in my former workplace.

In my service year as I corper,I have to intentionally lock my door from allowing my female neighbours and Corpers come into my room because I have two in my compound then discuss about sex brazenly and asking me if I had ever had it.

I don't know women could be so bold this way,I am still surprised that there are women who can make such randy jokes and have no qualms, I used to think that it is men that does it more,but from my experience I can say that most women are. I don't feel comfortable when I hear women make such jokes or say such things around me and to me I see such women as loose.

Please how can I handle these persons in my workplace without sounding abrasive or holier than thou.