not with providers, but with my first wife. Though her being pregnant didn't slow down our sex life appreciatively, it didn't make her any more attractive, and did reduce what was on the menu.

In Vegas we have had 3-4 pregnant providers still working

one (and an infamous one) did it twice. So I would say that there certainly is a demand for it out there.

It is not one of my fetishes. No wait I have NO fetishes.

If it works for both parties more power to them. I would be afraid to poke the babies eye out or something. lmao

Ya know those wierd cravings pregnant women get?

Well, years (and years) ago when wifey was pregnant, she wasn't in to pickles and ice cream, or broiled peanut butter sandwiches.  Her craving was one I had no problem helping out with.  She couldn't suck my cock enough!  LOL  
Now if I found a preggo with the same problem, I'd consider it.  However, unlike some, I DO NOT find them sexy, and the ones that advertise that they are lactating.......Yuck!
So stay dressed, tape sponges on your nipples, and say Ahhhh!

When I was pregnant

I got more calls than I could handle.I was always so wet and horney and o'ed so quick.I loved it. I couldn't believe the volume of calls I got. Alot of guys told me they missed their wives and girlfriends being pregnant.I had never felt so sexy than when I was preggo.I also got more gifts for the baby from regulars than I did from my baby shower.lol.I never got any weirdos though just nice sweet guys.It wasn't like they wanted to rub my belly or anything.bigger boobs and tighter  wetter pussy did it for them.Even guys who were curious became hooked.lol.

She didn't reveal this beforehand, and was not in late stage pregnancy.  Being a versatile hobbyist, and a nice guy (and she was well reviewed, at the time), I had an enjoyable meeting.  

Not something I seek, but I would not walk if this occurred again.

and have had the good fortune to enjoy this with about half a dozen gals over the last twenty years or so.

It's a combination of things:

The curves turn me on, the gal is usually more reponsive and orgasmic, the vagina is tighter, the nipples are are large and ruby red; and I think there is a taboo factor as well.

I doubt any gal would get pregnant just for this given the awesome responsibility that bring a child into the world entails.  As far as I know, each gal either planned thier pregnancy, or became pregnant as a result of an accident with their SO at the time.

Provider, no, mutually tested civilian - YES!

I love most types of women.  Pregnant women can be very sexy, but it is a bit of a fetish for sure.  Part of the fetish for me (and I think many) is to cum inside them  - which of course you would never do with a provider (as condoms should always be used with them).  

It can be a huge mental rush for a guy to come inside another man's woman who is preg by him.  I have only experienced this in the swinger community, not "the hobby".  

Even hotter were breeding parties an older couple invited me to my last year in college.  She was the secretary for the department head of my acedemic major and how we met.  She was an attractive Brit (love the accent).  They wanted a child.  For several months they had a select group of us "donors" over either Fri or Sat night most weekends.  It was several months because yes, they still invited once she was preg.

The absolutely most lustful, wanton time frame of my life was the third trimester of my pregnancy.  I would wake up in the morning doing naughty things to my pillow.  Sex on the brain CONSTANTLY.  My last ex was repulsed by the pregnant form, so I'm hoping if I ever have another baby, I'll find someone to indulge my uncontrollable eros.

once BEFORE the marriage... I had sex with a pregnant provider (she was in 1st trimester... ) wow, was she horny... but nothing is like sex with a gal who is lactating... love that!  it is truly sexy.

There is someone for everyone