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No, but if you have twins in your family there is a good chance of twins but soy stuff does not increase or decrease your chance of having twins.
Yes.
Yes
If you have enough lifetime happiness, you can purchase the reward "fertility treatment" which increases your hance of having twins or triplets, and eating 3 watermellons will increase your chance of having a girl (3 apples if you ever want a boy).
No but it may increase the chance of you having skin cancer !
Having sex four times a week will increase the chance of pregnancy when there are no fertility issues by increasing the likeliness of having intercourse during ovulation.
There is an increase in the chance of for instance, Downs syndrome as the mother gets older.
There is no guaranteed way to have triplets on the Sims 3. Your best bet would be to have both parents get the "Fertility Treatment" in Lifetime Rewards. This give you more chance of having twins or triplets. There is a way to control the gender of your baby though. Eating 3 apples gives you more chance of having a boy, while eating 3 watermelons gives you more chance of having a girl.
No. The little bit of ultraviolet light in a camera flash is harmless to people. A lot of celebrities smoke, though, and that DOES increase your chance of getting cancer.
Sharing needles , having frequent sex
As far as is known, only latex, strangely enough. People who are allergic to latex may go into anaphylactic shock if they eat cassava.
if i take a fertility pills when i got pregnant/