Since Spock's mother is a human, how is a romantic/sexual relationship with a Vulcan possible, given that one is emotional and the other suppresses their emotions?
vulcans do have feelings, actually more than the humans, they just don't express them in public (wouldn't surprise me if in private they are 'needy' precisely because they don't get to express their feelings all the time like humans do)
They never really suppress all their emotions and aren't really able to because if they were, they wouldn't need kolinahr (that is the actual suppression of feelings and isn't something that all the vulcans are able to master)
I think dating a vulcan might not be
that different from dating a very introvert person
it's not like ALL the humans are super emotional and open about their feelings either
And correct me if I'm wrong but aren't Vulcans physical with eachother through mind melds? Or can they be intimate like humans? Very confused.
There are clues suggesting that they mate and reproduce pretty much like humans do, with telepathy being a 'plus'.
I don't even think that the 'vulcan finger kiss' we see between Sarek and Amanda is really their only way to kiss either (but more like an affectionate gesture regarded as 'acceptable' when in public)
Both humans and vulcans are 'humanoid' races in that there are differences between them but also many similarities that make them compatible as mates.
In "Journey to Babel", Sarek said he married Amanda because "At the time, it seemed the logical thing to do."
He did have a bit of a smirk when he said that. I took that to mean that Sarek was, in the Vulcan way, having a bit of a joke. All that was missing was the wink.
I took that as Sarek's way of saying it was logical to marry the woman you love, but of course no well-mannered Vulcan would actually speak the word out loud.
I agree. Sarek saying that marrying her was logical is kind of romantic if one thinks about it

getting called 'logical' by a vulcan must be some huge compliment and he's basically saying that she was amazing and no other choice made more sense than marrying her. And of course, marrying someone you love is pretty logical!
Imagine a vulcan lady hearing him say that about a human!