Hi. dr. is testicals massage or pull testicals damage the sperms ? or weak the spearms ?

Yes and no: Scrotal ( testicular massage) should be done very gently. If the massage or "pulling" is uncomfortable then it may cause harm by causing internal bruising and if severe may harm sperm production. Please remember, it is only for pleasure, scrotal massage has no medical value at all. The sperm production is very sensative to temptature. Hot baths are not good for sperm production.