text: my friend asks how did he get molhuscum contagiosum downstairs? they said that is no a std but you get it skin to skin  but he said he wears condom when having sex and wonder if maybe by one time getting a bj by some girl but how .is that possible ? he says that he only has about 5 of them , should he be worry? and how can he prevent it so it wont happen again? and yes he only has one partner but she does not seem to have that. it is an infection caused by a virus called poxvirus. the infection can result from direct contact, including sexual contact, or by indirect contact, such as sharing towels, or from swimming pools.   the incubation period from the time of initial contact until the molluscum or spots appear is anything from two to eight weeks.  more info can be obtained from http://www.netdoctor.co.uk/diseases/facts/molluscum.htm