One of the most popular timing methods to sway for a girl (at least on Fertility Friend) is frequent BD through ovulation, so that is the fifth swaying theory that I tested in my study of charts. What I found is the frequent BD through ovulation is pretty close to 50/50, and if anything, slightly favors boys.
Overall the amount of BD on boy and girl charts is pretty close to identical. There were 878 BD times on the 250 boy charts (average of 3.51 BD times on the boy charts). There were 867 BD times on the 250 girl charts (average of 3.47 BD times on the girl charts).
Since there is no set definition for frequent BD, I chose to define it as at least 4 BD times during the five days prior to ovulation through the day afterwards. 232 charts out of the 500 I looked at followed this pattern, 113 girl charts and 119 boy charts.
Frequent BD charts:
- 4 BD times: 54 boy charts, 53 girl charts (sways boy 50.5%)
- 5 BD times: 36 boy charts, 34 girl charts (sways boy 51.4%)
- 6 BD times: 19 boy charts, 15 girl charts (sways boy 55.9%)
- 7+ BD times: 10 boy charts, 11 girl charts (sways girl 52.4%)
What seems to make the difference in whether frequent BD sways for a girl or whether it produces numbers that are pretty much the same as chance is whether there is BD on the day of ovulation. 141 charts with frequent BD had BD on the day of ovulation, 77 boy charts and 64 girl charts, resulting in a 54.6% preference for boys.
However, if the day of ovulation is avoided, frequent BD favors girls. 58 charts followed this pattern, 25 boy charts and 33 girl charts, resulting in a 56.9% preference for girls.
I'm not sure why frequent BD through ovulation has gotten such a following among women swaying for girls. As far as I can tell, it doesn't sway at all. The total amount of BD on boy and girl charts is virtually identical, the number of charts with frequent BD is virtually identical, and the rate of frequent BD on those charts (that is, the number of charts with 4 BD times, 5 BD times, etc.) is also virtually identical. And since I have over 200 charts following this pattern, I think the results are reasonably reliable.
Frequent BD may lower sperm count, but apparently if that BD includes the day of ovulation, the fact that the environment on ovulation favors boys seems to cancel out any benefit the lowered sperm count may have provided. The fact that many women swaying for girls have been successful with frequent BD through ovulation is probably partly due to the fact that this timing method is 50/50 and partly due to the other things also being done to sway (like diet, cm, and ph).
I don't think that frequent BD through ovulation is the WORST timing method someone swaying for a girl can use, since I don't think it strongly sways for boys. However, unless someone has fertility issues that make getting pregnant difficult - or is more concerned with getting pregnant than with having a girl - it would be much wiser to choose one of the timing methods that actually does favor girls.