You do not have to avoid coffee.

Int J Cancer. 2019 Jan 15;144(2):240-250. doi: 10.1002/ijc.31634. Epub 2018 Nov 16.
Coffee and tea consumption and risk of prostate cancer in the European Prospective Investigation into Cancer and Nutrition.
Sen A1,2, Papadimitriou N2, Lagiou P3,4,5, Perez-Cornago A6, Travis RC6, Key TJ6, Murphy N7, Gunter M7, Freisling H7, Tzoulaki I2,8, Muller DC8, Cross AJ8, Lopez DS9,10, Bergmann M11, Boeing H11, Bamia C3,12, Kotanidou A12,13, Karakatsani A12,14, Tjønneland A15, Kyrø C15, Outzen M15, Redondo ML16, Cayssials V17, Chirlaque MD18,19,20, Barricarte A19,21,22, Sánchez MJ19,23, Larrañaga N19,24, Tumino R25, Grioni S26, Palli D27, Caini S27, Sacerdote C28, Bueno-de-Mesquita B8,29,30,31, Kühn T32, Kaaks R32, Nilsson LM33, Landberg R33,34, Wallström P35, Drake I35, Bech BH36, Overvad K36, Aune D8,37, Khaw KT38, Riboli E8, Trichopoulos D5,12, Trichopoulou A3,12, Tsilidis KK2,8.
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Abstract
The epidemiological evidence regarding the association of coffee and tea consumption with prostate cancer risk is inconclusive, and few cohort studies have assessed these associations by disease stage and grade. We examined the associations of coffee (total, caffeinated and decaffeinated) and tea intake with prostate cancer risk in the European Prospective Investigation into Cancer and Nutrition. Among 142,196 men, 7,036 incident prostate cancer cases were diagnosed over 14 years of follow-up. Data on coffee and tea consumption were collected through validated country-specific food questionnaires at baseline. We used Cox proportional hazards regression models to compute hazard ratios (HRs) and 95% confidence intervals (CI). Models were stratified by center and age, and adjusted for anthropometric, lifestyle and dietary factors. Median coffee and tea intake were 375 and 106 mL/day, respectively, but large variations existed by country. Comparing the highest (median of 855 mL/day) versus lowest (median of 103 mL/day) consumers of coffee and tea (450 vs. 12 mL/day) the HRs were 1.02 (95% CI, 0.94-1.09) and 0.98 (95% CI, 0.90-1.07) for risk of total prostate cancer and 0.97 (95% CI, 0.79-1.21) and 0.89 (95% CI, 0.70-1.13) for risk of fatal disease, respectively. No evidence of association was seen for consumption of total, caffeinated or decaffeinated coffee or tea and risk of total prostate cancer or cancer by stage, grade or fatality in this large cohort. Further investigations are needed to clarify whether an association exists by different preparations or by concentrations and constituents of these beverages.

© 2018 UICC.

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Alcohol is more of a complicated subject, but with coffee there is mounting evidence that it protects against all sorts of trouble, including diabetes.

May I also suggest that you take a complete break from all treatments of any kind to try to solve the sexual impotence problem, because you are placing yourself on the very precarious path of building up hope and then having that hope crushed, and that leads to depression. Plus, you are so anxious and no treatments can counteract that. Give yourself a break, read up on the research about the safety - and benefits - of coffee - and try to enjoy incorporating coffee back into your life, and do not think about the sexual problem until 6 months from now.