 [ Symptoms ] boyfriend is semen is clumpy    hi my boyfriend did not used to smoke and his semen looked fine i compared it to others and now that he started smoking synthetic marijuana his semen looks clumpy and stuck together i mean its wet but it looks like shredded parmesan cheese and its in clumps i want to know like is it possible his sperm is still able to fertilize or is he shooting blanks [ Disease ] hi well its either the drugs or he is just not ejaculating enoufh if a guy dose not keep his sperm moving regular by masturbating or sex it will do that but if your worried get him of to a lab and get his sperm checked out ok good luck