Sperm leakage is completely normal, although some people make a big deal out of it.
Being fluid, it is completely normal for sperm to leak out after intercourse.
I read a Facebook post where a lady who was trying to conceive, complained that anytime she had sex with her husband, the sperm leaks out of her vagina.
The truth is that sperm leakage does not cause infertility, in fact, for the sperm to leak, it indicates there is enough sperm to result in pregnancy.
While some people are of the view that sex position contributes to sperm motility, and contraception, sperm cells travel quickly on their own to the fallopian tube where fertilization of egg occurs.
Therefore, whether, you hang your legs against the wall during sex, or lie in bed with your legs up after intercourse, it has little or no contribution to your chances of getting pregnant.