1. During lactation, menstrual bleeding does not occur upto six months. [2010] 2. Sterility is more common in men working in heat surrounds. [2010] 3. Prolonged breastfeeding is helpful in family planning. [2013][2012] 4. Pregnancy is associated with stoppage of menstruation. [2014][[2013] 5. Conversion of testosterone to dihydro-testosterone is essential for full sexual maturity in male. [2014] 6. Pregnancy usually does not occur during lactation.[2016] 7. Patients with sexual precocity are dwarfs. [2018] 8. Cryptorchids are usually infertile. [4] [NEW PATTERN 2021] 9. Lactation is a natural method of contraception. [4] [NEW PATTERN 2021] 10.Removal of ovaries before 6 weeks of pregnancy leads to abortion. [2016 supple] [2018 supple.] 11. Parturition is achieved by a positive cycle. [2024] 12. Ovariectomy within 6 weeks may lead to abortion.[2025]