hello user thanks for contacting HCM for your health related query. i can understand your concern , but through this post i want to assure you to not to worry so much on this issue. masturbation is a very normal act that nearly all men practice , it does not lead to erectile problems on its own, neither there is any study which can relate loss of memory due to masturbation. There is another possible explanation although for your problem although , that is anxiety - it may not be very apparent to you , but it is apparent in your problem and concerns , and that is leading you to remain preoccupied with this sexual issue - like you are wondering that one testicle is working and another not - do not reach to these conclusions until told by any expert physician after examination and investigations , as these are the thoughts which are preoccupying your mind and might be causing some forgetfulness of other issues . I suggest you to visit any psychiatrist for evaluation , who would treat the issue with some anti-anxiety medicines and/or some beahavioral therapies like relaxation exercises. hope i answered your query - any followup queries are welcome. if satisfied please rate the answer