Twins haveing sex

All pregnancies start when a sperm fertilises an egg. This forms twins. These twins are called fraternal twins, dizygotic twins meaning two zygotes or non-identical twins. The technical name for this is dichorionic. Fraternal twins can be the same or opposite sex and their genes are as different as any other brother and sister.
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Sex-specific Sibling Rivalry in Child Health: Evidence from over 190,000 Twins (P18-098-19).

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Twin - Wikipedia

Back to Your pregnancy and baby guide. In recent years, fertility treatments and the fact women are having babies later has made multiple births more common. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys. Non-identical dizygotic twins happen when 2 separate eggs are fertilised and then implant into the woman's womb uterus. It's usually possible to find out if you're having twins through your dating ultrasound scan , which happens when you're 8 to 14 weeks pregnant.
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Twins with Different Fathers: Is It Possible?

Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse , which can lead to twin babies from two separate biological fathers. Homopaternal superfecundation refers to the fertilization of two separate ova from the same father, leading to fraternal twins ; [3] while heteropaternal superfecundation is referred to as a form of atypical twinning, genetically, the twins are half siblings. Superfecundation, while rare, can occur through either separate occurrences of sexual intercourse or through artificial insemination. Superfecundation most commonly happens within hours or days of the first instance of fertilization with ova released during the same cycle. The time window when eggs are able to be fertilized is small.
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Twins are two offspring produced by the same pregnancy. In contrast, a fetus that develops alone in the womb is called a singleton , and the general term for one offspring of a multiple birth is multiple. The Yoruba peoples have the highest rate of twinning in the world, at 45—50 twin sets or 90— twins per 1, live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side.
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