thank you all for your information.
I found it difficult to see the difference though between a male/female butterly. I have now two and one is really big (25 cm) with a huge body, so that with no doubt is a female. and the other one is a lot smaller (20cm) with somehat sharper wings. I didn't see very much difference between their antenaes. but since this smaller one laid eggs just this morning, it's clear 
the difference betwee the pupae and that I have to take them out of the cocoon is one step to far for me just jet. I had to take one out because he got stuck in his cocon and brrr, that was one experience enough for me as for taking butterflies out.
but the pictures are very helpful, great!!!
I hope that it's ok to ask so many questions. I browse the forum, but it's not easy for me reading the german language.
regards
Margareth