From a Christian viewpoint, how might one answer this question?
"I have recently taken an interest in Christianity, but I have been in a relationship for the past couple years. We don't see marriage possible within the next few years; Does this mean we need to stop having sex?".
Well, from 'interest' it seems (correct me, please--seriously, respectfully, always) if I'm wrong) that you are not yet a Christian, so don't 'leap' before you jump in:
In other words, take it one step at a time like get a Bible, or if you have one, read Matthew, Mark, Luke and John plus Romans, 1 Corinthians and Galatians (the last three are Paul's letters sometimes referred to as Pauline Epistles),
and remember that Jesus is the Redeemer; He came to save sinners, not to beat up nonbelievers, so read The Beattitudes (Matthew chapter 5 through chapter 7),
and pray, humbly.
I stutter when that is how I feel, so use your own words, from wherever you are, privately, to God, you know like, 'I don't know how to do this, please help me, lots of people say one thing and then another Christian says something else, and I feel confused, and I don't know, just could you help me know what to do?'
Then listen...
Prayer is more about listening for God's will and direction (for me) than it is about talking on and on and on, because, well, I get to do that wih other regular fall-able human beings, so I need to listen to God who is Perfect Love.
Please send me a private message or just visit my page-and do the same with anyone who seems gentle and honest and willing to help, so if I don't seem to be someone who might help you, don't listen to me:
Pray to God, instead.
And welcome to the Christian Forum. There are so many, many people here, and games to play, and serious to silly discussions. I hope you find the guidance and fellowship you need.
~ Carolyn
P.S. This is how I would handle it if it's a personal question, or what you might want to tell someone else in this position.