In one sentence, describe what the following article is about:

Some experts advise using sexual positions that encourage deep penetration, such as a rear-entry position, when trying to conceive a boy. The logic behind this is that ejaculating during deep-penetration sex places the sperm as close as possible to the cervix, giving the fast-moving male sperm an advantage. With shallow penetration, sperm may be deposited farther from the cervix, which means that the more durable female sperm (which can survive longer in the vagina) may have the advantage. Male sperm, which are more fragile than female sperm, tend to die faster in the acidic environment inside the vagina. Giving the female partner an orgasm can improve the chances of the male sperm because during female orgasm, extra cervical fluid is released. This makes the environment more hospitable to male sperm, increasing the chances that they make it to the egg alive. There are also claims that the orgasmic contractions can help push the sperm into the cervix faster. Just remember, these aren't proven by science. Some research suggests that the older the parents are, the higher the chances are of having a girl. Therefore, if you're trying for a boy, it might be best to start early. The chances are highest for a woman to conceive a boy before age 30. It's age 35 for men.
Have sex in a rear entry position. Try for a female orgasm. Consider having a baby before your reach 30 or 35.