hi..thanks for writing....i have understood your concerns.. you have not mentioned but I consider that you are married..premature ejaculation in this age is mostly of psychological origin...the anxiety about the sexual performance and partner s satisfaction is main reason..other reasons like genetic origin and penile sensitivity are also proposed for premature ejaculation, but rare.. premature ejaculation can be treated effectively by behavioral techniques [sex therapy, in which both partner participate] and by drugs like, SSRIs anti depressant medications..before going for drugs you shud practice behavioral techniques first... you shud also think about losing your weight by physical exercise and dieting.. syphilis is sexually transmitted disease, in which initial manifestations are development of ulcer over the contact regions [mostly genitals], so it would be difficult to sex and also one shud avoid because there are chances of transmission..obviously there are sexual problems with syphilis but not exactly the premature ejaculation..with proper treatment it resolves completely... in my opinion you shud consult a psychiatrist or sexologist and ask for help..give details about your problems and follow the advice.. i hope you will find this advice helpful..best luck