Why is my fiance no longer "in the mood"?

You said you've got a little kid. Maybe she's tired and feels more like a mom than a sexy finance. If that's the case, you need to change how she thinks about herself, and make sure she's not too tired from tending to the baby. Help her relax (massage her, cook dinner for once or just offer to do the dishes), and help put her back in that sexy mode by getting a baby sitter and taking her out. I think a lot of people take relationships for granted after awhile, but if you stop putting in the effort (time, planning, flattery, etc) the relationship (and the sex) can go to shit pretty fast. Make time to spend alone together and don't just expect her to put out when she's tired at the end of a long day. I really think its true in many cases when they say that women need to be "in the mood". Help get her there the ways you used to.

oh and if you can't figure out what might work well, you can always tell her you love her and want to spend more time having fun together, then ask her for ideas.
Good luck!

If she did not keep the baby there could be a lot of emotional distress connected with the lack of activity. It is hard to know what you could of had. If she is still pregnant, It may be uncomfortable for her depending how far along she is. Just talk to her about it. If she did give up the baby you need to find out how she is feeling. She may be unsure of your future together. If she is in to kinky stuff, take her to a local sex store, get some massage oils, and "toys". maybe she just needs a little kink to get her going again. If you have never been engaged before, it just sometimes happens that you don't have sex as much. You need to try somethings that will stimulate her mind, body and soul. She will come around. If not then she is just not interested any more and you may need to think of separation.

Random thought: is there a wedding date? She might be thinking about that more than sex based on her being pregnant (which is probably making her insecure and emotional).

Maybe you should do something romantic like plan a nice dinner and make it a special thing for her rather then making it out like she is just doing you a favor.

I hate sayin this is it possible she getting it from someone else. Maybe since she was pregnant she just doesn't feel attractive tell her she is. Good luck. It could be just going through a hard time and maybe in time the sex will get back to hot and heavy.

Read "The Female Brain". It's written by a female psychiatrist and will answer many of your questions about females. You will never totally understand them, but you'll be closer.

In summary, that's what you're facing for the rest of your life if you marry her. So the marriage better be for lots more than sex, because you ain't getting nearly as much as you think.

Your brain is wired for sex. Hers is wired for relationships. Relationships don't need to include sex. She'll give you enough sex to get married. Then she'll give you just enough to keep you around to produce kids and provide for them. Later when the children arrive they stimulate the part of her brain that is stimulated by sex, so she just doesn't need it any more from you. At peri-menopause even she has no idea what's going on. After menopause there is likely zero sex drive for the rest of her life and the number of divorces filed by women sky rockets.

Think I'm kidding? Read the book. Or others like it that will be honest without the euphemistic false hope.

Sound bleak? It is. As the guys in their 50s who will be honest with you. We're all jacking.

Press the issue and don't settle for "I'm just not in the mood. "

In other words, tell her how it makes you feel when she simply ignores your advances and that when you wish to discuss it that she dismisses it with "not in the mood. "

There a few viable possibilities, one which is what others have alluded to - she is cheating, or two she is not feeling beautiful because of the pregnancy or quite possible a hormonal imbalance. Pregnancy can play havoc on her hormones as the body goes through quite a few dramatic changes.

I should also clarify, don't press the issue as solely being a "sex" issue. Perhaps she feels a bit more vulnerable during pregnancy and she has the impression that all you care for is sex from her. Don't know. Food for thought.

Attraction is not a choice, look at non verbal communication skills for seduction, being a boy/girl friend is not a good thing for sexual attraction, the normal thing is to be attracted by others, if you are a modern open couple you can go to swingers clubs, but as it is a little percentage of couples, you have two choices, look for other, or change your behaviour

I think samthan might be right. it sounds like she is getting it someplace else, especially if she is as beautiful as you say, that would mean that she doesn't feel that she is unattractive.
it could be guilt after she got pregnant, maybe it isn't yours and she feels guilty and doesn't know what to do now. I hate to hear about things like this happening and hope I'm wrong, but you should be ready for the worse, and ask questions because only she can tell you whats wrong and why she isn't sexually interested. good luck