Please tell me the possibility of an STD

Based on the scenario you've described, the possibility of contracting an STD is extremely low, essentially negligible. Here's why: * STDs and Transmission: Most STDs are transmitted through direct sexual contact (vaginal, anal, or oral sex). Some, like herpes or syphilis, can be transmitted through direct skin-to-skin contact with sores. However, the virus needs to be viable and in sufficient quantity. * Dilution and Environment: Even if the other person had an STD, the virus or bacteria would be significantly diluted by the water. Additionally, outside the body, many STD-causing organisms degrade rapidly, especially on surfaces like ice and in water. * No Open Sores: You mentioned you didn't have any open sores in your mouth. Intact skin and mucous membranes are excellent barriers against infection. Without a direct entry point, it's very difficult for a pathogen to establish itself. * Absence of Visible Signs: You mentioned the person had no visible issues or sores. Many people don't show symptoms, but the risk is lower if they have no active lesions. In summary, while it's always good to be cautious, the risk of contracting an STD from sharing ice in this manner is extremely low. You don't need to worry much about this particular situation.