What could be the reason for developing soft boils on my penis after sex?

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I read your query and understand the concern. Considering your history and the attached images (attachments removed to protect the patient's identity), it appears to be genital warts. Genital warts are viral infections caused by human papillomavirus (HPV) and transmitted through direct skin contact or sexual contact with an infected person. As you have mentioned, a history of having physical contact, then it may have been transmitted in a similar manner. Genital warts may take weeks to settle and sometimes even months or years to disappear and may remain asymptomatic. Therefore, I suggest you the following measures. (Consult a specialist doctor, talk with them, and take medications with their consent.) Take Tablet Zinc acetate twice daily in the morning and night after food for one month. Avoid unprotected sex, notify your sexual partner about the same, and advise your sexual partner to get treated in case of any lesions. Kindly consult a doctor for HPV (human papillomavirus vaccination) to prevent reinfections with a different strain. Electrocautery and cryotherapy are operative procedures done by a dermatologist to treat these lesions. For this procedure, you may need to consult a dermatologist in person. Kindly consult a dermatologist for further evaluation and the treatments mentioned above. Genital warts may be recurrent; therefore, taking adequate precautions during intimacy is important. I hope I was helpful to you. Thank you.