It's possible for someone with HSV-1 to transmit the virus through skin-to-skin contact during oral or genital sex, even when they are not showing any symptoms. However, transmission rates can vary based on factors like viral shedding and immune response. Some individuals may have a natural resistance to contracting herpes viruses.

Additionally, it is important to note that not everyone who has been exposed will necessarily develop an active infection; some people may carry the virus without experiencing noticeable symptoms. It’s always best practice to use protection and communicate openly about STD status before engaging in sexual activities.