Timing of intercourse.
Simpson
J L
JL
Gray
R H
RH
Queenan
J T
JT
Mena
P
P
Perez
A
A
Kambic
R T
RT
Pardo
F
F
Barbato
M
M
Spieler
J
J
D003075:Coitus; D005193:Family Planning Services / Q000379:methods*; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D011247:Pregnancy