It's a scam
Review about Marital Affair.co.ukThis one of those 'White label' sites where most of the advertisers didn't join through the same portal as you did - and then grumble that one is married! Certainly has a singles site attached too.
I came across one of lady advertiser's profile that reckoned she had received 2000 replies...the ratio of men to women is so far out as to a non-starter. Avoid. :@
Pros
None
Cons
It's a ripoff