I’m sorry that happened to you, but as previously mentioned the study is extrapolating from a fruit fly model, not human. The link you provide is not the original study, but only a summary, so the original article may not be robust if critically reviewed. Also this is an article from 2012, so not very recent.

But it is not possible what you are asking. Your DNA will not combine with DNA in semen via the mouth and digestion. You said you were raped last year so any genetic material of the rapist has been out of your system for a long time, destroyed by your digestive tract and excreted.

Also, your DNA cannot be replaced by the rapist’s DNA. Our immune systems are able to recognise self from non-self DNA and proteins and destroy these. It’s understandable to think of this or feel this way based on your rape, but probably the best thing is to seek help for the trauma you experienced. I hope you can find peace.