I don't know if I understand your question correctly, but I will try to answer it the best I can. I think you are asking if it matters how you have sex to have twins? Or maybe you are asking how it happens?

When twins are conceived, it has nothing to do with the amount of semen. A woman normally releases one egg for fertilization. When twins are conceived, she drops two. This happens either because of heredity reasons or because the woman is over 35. In rare cases, a woman drops two for no reason at all. She may even drop three, but this is almost 100 percent unlikely, but I have seen it happen.

Then there is the case of fertility drugs. This causes the woman to drop an egg when she has previously been having trouble doing this normally.... and sometimes it causes her to release much more than one or two, resulting in the large multiples that we often hear about in the media.

Artificial insemination or invitro fertilization (which also uses fertility drugs) can also cause the birth of multiples. The clinics want to give the couple the best chance of having a baby, so if more than one egg is used, twins could be the result of the procedure.

The only way that you could have twins without having them in your genetics or waiting for your smaller chances in other things is to talk to an OB/GYN or fertility specialist about your options.