can muslim(boys) really marry as many as they can?

Up to 4 at any one time unless you are a Shi'ite. I do not want to get into a Sunni-Shi'ite debate here but they marry up to 10, because of the way they interpreted the Quran (Koran). Even so it is not a simple matter of choosing any one we like because normally there are other factors which need to be taken into consideration. These include the man's ability to take care of the family (unless the girl does not mind the man not being rich) and his mental preparation. Different groups may have slightly different interpretations of the rulings which may have been influenced by cutural traditions. You may find someone challenging the above. By the way true Muslis use the Quran and the Hadith (authenticated sayings of Muhammad, peace be upon him. Many Muslims nowadays (and most non-Muslims who do) read only the Quran and try to interpret it without referring to the major scholars like Imam as Shafie and Imam al Ghazali. all the best, rosdimy