ive not had problems conceiving so cant imagine how it must feel like to make the decision to have a child and then sit and wait and wait. My fella and his ex wife tried for years though so he knows all about it.
The only think i can suggest if they are both healthy, non-smokers etc is to have sex in middel of night. Only if both awake and in the mood, no point in setting alarms and making yourself perform if not in mood.
I can accurately date when i fell pregnant each time and both of those times were in middle of the night. My reckoning is that
a) your body is relaxed
b) you fall asleep and dont get up, so body doesnt expel the sperm so readily as it would if you were walking about straight after
c) you tend not to get up and rush to the loo, again avoiding disposing of the good stuff.
Most important thing though is for them to relax.
have they also considered recording the dates for ovulation so that they can focus on the 2 or 3 days either side?