Human blastocysts should hatch from the shell and begin to implant 1-2 days after day 5 IVF blastocyst transfer. In a natural situation (not IVF), the blastocyst should hatch and implant at the same time-about 6 to 10 days after ovulation.
Enlargement of the prostate-- benign prostatic hyperplasia or BPH--is a common condition in older men that typically results in a narrowing of the urethra. BPH often makes urination difficult and sometimes painful. In addition, BPH and its associated treatments sometimes results in adverse sexual side effects.
The relationship between masturbation and prostate cancer is a bit hazy. A 2003 Australian study published in BJU International linked frequent ejaculation early in life with reduced risk for prostate cancer later on. In both these studies, ejaculation frequency included sexual intercourse and masturbation.