When to Limit Sex for Baby Making Few doctors will encourage less sex while you are trying to conceive. Frequency of sex Shettles believed men should ejaculate more frequently when trying for a girl, and abstain for up to 5 days before trying for a boy. Join others who know what you're goig through in the Essential Baby forum. Some scientists, such as Dr Patrick Schoun, have suggested that negative ions help sway for girl babies and positive ions for boys. If you are no longer interested in having sex, you probably will not have as much, even if it is your fertile time--decreasing your odds of conceiving. If you want to welcome a bundle of pink, can tweaking your diet in other ways boost the chances? This is because he believed that men with lower sperm counts were more likely to conceive girls, while men with higher sperm counts usually conceived boys. If you are comfortable with taking a more relaxed approach to getting pregnant or are just starting to try, you might just want to have lots of sex, concentrated when you think you may be fertile around mid-month for most women. Ejaculating every two to three days keeps sperm healthy. But, other doctors and researchers have reported that too-frequent sex can result in abnormal sperm morphology. Making the vaginal environment and body chemistry "more hospitable" to one or the other type of sperm can influence conception, he says. If you search the web for "gender selection" you'll get multiple hits to articles, a book called How to Choose the Sex of Your Baby, and several commercial web sites selling gender-preference kits. In the context of assisted reproduction, this simple treatment may assist in improving sperm quality and ultimately achieving a pregnancy. Give each other full body massages. Bracelets and air purifiers that supposedly attract negative ions are available to help conceive girls. Here are a few popular methods hopeful parents-to-be use to try to get a baby of their preferred gender — and what an expert says about whether they could really work. But one of the big questions is how frequently should you have sex for pregnancy?