Yes , you are. The 5th is "illicit love affairs", i.e., sex outside of wedlock. Mistresses and gigolos live in the 5th.
This means Mars rules Lover Boy. Mars and Jupiter are trine, but Mars heads off into Virgo, a new and different energy field. So how will you interpret that?
If we go back to step one on this thread, ChildofVenus writes about her "friend" being angry and "seeing each other again." , which is not necessarily romantic.
Then we move onto "Ok, so I asked if we would be sexually involved".
Just to point out that the houses in these sentences are shifting, and like Greybeard wrote, this is basic to interpreting the chart, so this presents a big problem.
Last week by coincidence two people sent me almost the identical chart, for completely two different queries, and there were two completely different answers. From basically the same chart, because the questions touched different houses.
With reference to ChildofVenus' chart, a friend would be the 11th house. Venus is the ruler of the 11th, inconjunct the ascendent ruler so not connecting there, and approaching an opposition to cold Saturn. So the answer would be no. Moon from the ascendent separates from easy trine with mercury to an inconjunct with separative Uranus confirming the negative.
"Would we be sexually involved?". This is a different question.
So here the "other" is 7th, and we look for connections between 7 and ascendent but also 5 (love affairs) and 8 (querent's sex). Now we have 7th ruler mercury approaching a conjunction with 5th ruler mars, in the querent's 8th house of sex. Mars moves towards a trine with retrograde Jupiter. So the answer to this question would be yes.
So you see, the precision of the question, and understanding what the question is, would be the first step to interpreting the chart. And this is so important.
Assigning the significators is essential, and if you don't get that right, the answer will be skewered. And the significators are assigned according to the houses involved in the question asked.