It is worthwhile to note that your partner is likely to be experiencing many of the same emotions that you are—perhaps to an even greater degree. She has never been through any of this before, either. The physical and emotional changes she is experiencing, while giving her immense joy on one level, may fill her with doubts. She may also wonder what all of this means to the two of you as a couple.

She may worry about your feelings for her at this time. Do you still find her attractive? Does she still turn you on?

What Stage Is She In?

The key to sex during pregnancy is understanding the stage your partner is in and adjusting to it. Because your partner may frequently feel nauseated and tired thanks to the morning sickness the first trimester brings, her desire for sex may be somewhat limited. Your partner's body grows to its biggest proportions in the last trimester, and feeling heavy and (as always) tired she may not exactly feel like a sex kitten at this time either.

One study found that after about the third month, 10 percent of all pregnant couples were not having sex. By the ninth month, the number of abstaining couples had risen to 33 percent. However, in this same study, about 40 percent of all the couples surveyed were still having and enjoying sex into the ninth month.

Every woman and every woman's pregnancy are different. But, generally speaking, the best time for sexual relations for pregnant couples is in the second trimester—from months four to six. Your partner's morning sickness has passed, and yet her body has not gotten ungainly. Her hormones may have imbued her with that famous pregnancy “glow” when everything about her radiates with she-wolf energy. These surging feelings of health and wellness may translate into a renewed interest in bedroom activities.

Tuning into Her

A man's body is, in the sexual sphere, obviously far different from a woman's. Men do not menstruate, and their moods do not rise and fall during the month because of this. Though a woman stops menstruating during pregnancy, her moods are still connected to the rhythms of her body.

Don't take it personally if your partner seems uninterested in sex. It is not because she suddenly finds you less attractive or somehow less of a man. Don't blame her, either. Her feelings about sex are being shaped to a large degree by the hormonal changes occurring inside her body.

Because of the physical changes she is experiencing, her libido may have decreased. She may simply not be as interested in sex as she was before. It's nobody's fault; it's just the way it is. Then again, there may be instances in the second trimester or at other times during the pregnancy when she is just as horny for you as she was when you first started sleeping together. It is up to you to assess her mood in terms of sex and act accordingly.