Besides, I have been given several other hand-
jobs by different prostitutes. Sometimes she used
fingernail strongly (what if her fingernail contains blood?), sometimes she used hot towels to clean my penis (what if the hot towel used by previous customer was not washed properly?), and sometimes she washed my anus very strongly but I have some haemorrhoids (what if her hand touched the blood coming from my anus?) Do you think all these cases are 100% safe, both theoretically and practically?