Yes, it’s true: Regular, orgasmic sex may improve your odds of getting pregnant.

Regular sex primes your immune system.

“The more frequently a woman engages in sexual activity, the more often her immune system gets the message that it’s time to reproduce,” researcher Tierney Lorenz says. Lorenz published a study suggesting that regular sex primes a woman’s immune system so that her body is more hospitable to getting and staying pregnant.

Another recent study found something similar, but even more fascinating: Women who had more frequent sex had lower levels of sperm and fetus antibodies (the kind that would attack the sperm and/or fetus, deeming it a foreign object). Basically, women who have sex more often are more physiologically disposed to getting pregnant.

Female orgasm may help retain sperm.

Scientific research indicates that the vaginal and uterine contractions that occur during a woman’s orgasm help move the sperm up through the cervix faster, propelling it into the uterus and fallopian tubes, where the egg passes through after ovulation and fertilization usually occurs. As a result, they increase the chances of conception when having sex during a woman’s “fertile window.”

One study found that when female orgasm occurred a minute or less before male ejaculation, sperm retention was greater. Interestingly, the researchers also found that when a woman’s orgasm happened up to 45 minutes after male ejaculation, she still had higher sperm retention than non-orgasming women.

Rx? More sex.

I understand that regular, orgasmic sex isn’t always easy to fit into our schedules. But with the increasing concerns of fertility challenges, my professional advice is to try to have more sex. Ideally, a couple who is trying to conceive (or planning on trying to conceive in the next six to 12 months) should be having sex two to three times per week. With orgasms!

In my clinic, I work with women who are having challenges getting pregnant. None of them are having enough sex. Nor have they had regular, orgasmic sex in quite some time. As I always say, “Babies are made out of love, not honey-I’m-ovulating sex.” This research supports that notion.

If you want to make a baby, have some sexy-time fun on a fairly frequent basis. Not only will your immune system be more primed for pregnancy, but you and your partner will feel even better than you currently do. Sex is supposed to be fun. Baby-making is supposed to be fun too!

These 5 tips will make sex more fun…

1. Communicate.

Ask each other what feels good. And then do it.

2. Go shopping.

Buy lingerie together—something that turns you both on.

3. Take your time.

Explore one another’s bodies to allow for deep, open intimacy.

4. Connect.

Plan a special date night and let things unfold from there.

5. Make it about her.

Men, tell her how much you love her body. Outwardly obsess over all you love about your mate.

This article has been adapted from Aimee‘s book, Yes You Can Get Pregnant: Natural Ways to Improve Your Fertility Now and Into Your 40s.