Please tell me expressions similar to 'precious' in Korean.

I have been studying Korean language and culture since 2008, but sometimes I get confused when expressions like 'precious', 'penis' come up. As a Korean language learner, I am familiar with somewhat direct words like penis, vagina, and fuck, but I seem to lack knowledge of softer expressions. I am curious about more natural words for expressing genitals or sexual relationships as a Korean language learner. If there are expressions or metaphorical phrases that foreign learners don't often hear, I would appreciate it if you could let me know. I am also curious about how these expressions are actually used in Seoul, especially in Gangnam or Hongdae. Can you share your experiences or advice with me?