When my gf plays with my penis putting hand inside my jeans in sitting position, after she plays it pains in testis and above the penis near stomach?

See answer: Most likely explanation of testicular and lower abdominal discomfort related to sexual stimulation is temporary fluid/vascular congestion in the testicles and prostate caused by sexual arousal (usually prolonged) and a "build-up of pressure" not relieved by ejaculation (sometimes referred to using the slang term, "blue balls"). Usual cure: limit degree/duration of sexual arousal or ejaculation.