BIOs-360 Class 12
NCERT/CBSE
NEET/JEE
Textbooks
BLOG
Program List
More...
Periodic Abstinence: Avoiding coitus from day 10-17 of the cycle (fertile period); Coitus Interruptus: Withdrawal of penis before ejaculation; Lactational Amenorrhea: Absence of menstruation during intense lactation (max 6 months).