It is important to note that herpes (HSV) typically spreads through direct contact with the skin, mucous membranes, or bodily fluids of someone who has an active infection. While saliva can contain the virus when a person has oral herpes (cold sores), transmission via finger-to-genital contact using saliva as lubrication is less common but not impossible.

If a person with oral herpes touches their lips and then uses their fingers during sexual activity without washing them thoroughly, there could be potential for viral transmission. To reduce this risk:

1. Ensure frequent handwashing before any intimate contact.
2. If engaging in activities where fingering may occur after touching one's mouth area, use gloves or barrier protection like condoms on fingers.
3. Communicate openly about STI status and history with partners to make informed decisions together.

However, since every situation varies based on specific factors such as individual health conditions and how recent outbreaks were present if at all – it’s advisable individuals get tested regularly & consult healthcare professionals for personalized insights into risks & preventive measures suited to them specifically.”